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Translation
King James Version
At that day ye shall know that I am in my Father, and ye in me, and I in you.
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KJV (with Strong's)
At G1722 that G1565 day G2250 ye G5210 shall know G1097 that G3754 I G1473 am in G1722 my G3450 Father G3962, and G2532 ye G5210 in G1722 me G1698, and I G2504 in G1722 you G5213.
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Complete Jewish Bible
When that day comes, you will know that I am united with my Father, and you with me, and I with you.
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Berean Standard Bible
On that day you will know that I am in My Father, and you are in Me, and I am in you.
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American Standard Version
In that day ye shall know that I am in my Father, and ye in me, and I in you.
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World English Bible Messianic
In that day you will know that I am in my Father, and you in me, and I in you.
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Geneva Bible (1599)
At that day shall ye knowe that I am in my Father, and you in me, and I in you.
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Young's Literal Translation
in that day ye shall know that I am in my Father, and ye in me, and I in you;
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In the KJVVerse 26,689 of 31,102

Study This Verse

SUMMARY

Unveils a profound spiritual reality that Jesus promises will be fully realized by His disciples after His resurrection and the outpouring of the Holy Spirit. This verse speaks of a dynamic, reciprocal indwelling: the Son in the Father, believers in the Son, and the Son in believers. It signifies a new covenant intimacy, where the knowledge of God is not merely intellectual but an experiential communion, transforming the believer's relationship with the Triune God.

CONTEXT

  • Literary Context: This verse is embedded within Jesus' extensive Farewell Discourse, spanning John 13 through John 17. On the night before His crucifixion, Jesus addresses His disciples' profound distress and confusion regarding His impending departure. He is preparing them for a new phase of their relationship with God, one that transcends His physical presence. Immediately preceding John 14:20, Jesus promises the coming of the Holy Spirit, the "Helper" or "Comforter," who will abide with them forever and enable them to know Him in a new way (John 14:16-18). The phrase "At that day" directly points to the post-resurrection and Pentecost era, when the Spirit's indwelling would make this mutual union an experiential reality.
  • Historical & Cultural Context: In the Jewish understanding, God's presence was often localized, whether in the Tabernacle or the Temple, or manifested through specific acts of divine intervention. The concept of God "dwelling" within individuals, especially in such an intimate, reciprocal manner, was revolutionary. While prophets and kings might receive the Spirit for specific tasks, the promise of a universal indwelling for all believers marked a radical shift from the Old Covenant to the New. The "knowing" Jesus speaks of is not merely intellectual assent, which was common in Greek thought, but the deep, relational, and experiential knowledge (Hebrew yada') that characterizes covenant relationship, implying intimacy and personal involvement. This spiritual reality would redefine the very nature of worship and communion with God for His people.
  • Key Themes: This verse contributes significantly to several major themes within John's Gospel and broader biblical theology. Foremost is the theme of Divine Union and Indwelling, articulating the profound interconnectedness of the Trinity and, remarkably, the believer's participation in that divine life. Jesus' declaration, "I [am] in my Father," reaffirms His unique oneness and co-existence with God the Father, a truth consistently emphasized throughout John's Gospel, as seen in His claim, "I and my Father are one". The truly revolutionary aspect is the extension of this indwelling to believers: "ye in me, and I in you," signifying a spiritual union where believers are united with Christ, and Christ dwells within them through the Holy Spirit. This leads to the theme of Spiritual Knowledge and Experiential Understanding, where "ye shall know" denotes a deep, transformative understanding born out of the Spirit's indwelling, enabling believers to grasp the reality of their union with Christ and, through Him, with the Father. Finally, it powerfully illustrates the New Covenant Relationship, where God's presence is not external but internal, transforming believers from within. This foreshadows the profound imagery of the "vine and branches" in John 15, emphasizing abiding in Christ as the indispensable source of life and spiritual fruitfulness.

EXPOSITION AND ANALYSIS

Key Word Analysis

  • know (Greek, ginṓskō, G1097): This verb signifies more than intellectual apprehension; it denotes an experiential, intimate, and relational knowledge. It implies a personal acquaintance and a deep, transformative understanding that comes from direct experience. In this context, it is the Spirit-enabled realization of the mutual indwelling.
  • in (Greek, en, G1722): This crucial preposition denotes not merely physical location but a deep, intimate union, a sphere of influence, and identification. When Jesus states "I am in my Father, and ye in me, and I in you," it highlights a reciprocal, interdependent relationship that is the very essence of the Christian life, signifying spiritual unity and communion.
  • day (Greek, hēméra, G2250): While literally meaning a 24-hour period, in this context, "At that day" figuratively refers to a specific, defined period or era. It points to the time inaugurated by Jesus' resurrection and the subsequent outpouring of the Holy Spirit at Pentecost, marking the dawn of the New Covenant age when this promised spiritual reality would become accessible.

Verse Breakdown

  • "At that day ye shall know": This clause sets the temporal and epistemological framework. "That day" refers to the era initiated by Jesus' resurrection and the coming of the Holy Spirit (Pentecost), when a new level of spiritual understanding and communion would be revealed. "Ye shall know" indicates an experiential, not merely intellectual, understanding that would become clear through the indwelling presence of the Spirit.
  • "that I [am] in my Father": This foundational statement reaffirms the eternal, unique, and essential unity of Jesus with God the Father. It speaks to the divine nature of Christ and His inherent oneness with the first person of the Trinity, a core tenet of Trinitarian theology. This union is the basis for all subsequent spiritual realities.
  • "and ye in me": This revolutionary declaration describes the believer's profound spiritual union with Christ. Through faith and the work of the Holy Spirit, believers are incorporated into Christ, sharing in His life, death, and resurrection. This is a positional truth, signifying their new identity and standing before God.
  • "and I in you": This clause completes the reciprocal indwelling, emphasizing Christ's active presence within believers through the Holy Spirit. It speaks to the dynamic, empowering, and transforming reality of Christ's life animating the believer, providing spiritual vitality, guidance, and the ability to live a life pleasing to God.

Literary Devices

John 14:20 employs several literary devices to convey its profound theological truth. The most prominent is Reciprocity, evident in the repeated structure of "I in my Father, and ye in me, and I in you." This creates a sense of mutual indwelling and interconnectedness, emphasizing the intimate, two-way relationship between the divine persons and between Christ and His followers. The phrase "At that day" functions as Foreshadowing, pointing to a future pivotal moment (the coming of the Holy Spirit) that will unlock a new spiritual understanding and reality. The use of the preposition "in" (Greek: en) serves as Symbolism, representing not merely physical location but a deep, spiritual union, a sphere of existence, and a shared identity. This repeated "in" highlights the profound intimacy and unity that characterize the relationship between the Father, Son, and believers.

THEOLOGICAL AND THEMATIC CONNECTIONS

John 14:20 is a cornerstone for understanding the profound reality of the believer's union with Christ, a central theme in Pauline theology as well. It reveals that the ultimate purpose of redemption is not merely forgiveness of sins, but participation in the divine life through Christ. This mutual indwelling means that believers are not just forgiven, but are brought into the very fellowship of the Trinity, experiencing God's presence not externally, but as an internal, transformative reality. This union forms the basis for spiritual power, identity, and the ability to live a life that reflects Christ. It underscores the Trinitarian nature of salvation, where the Father sends the Son, the Son accomplishes redemption, and the Spirit applies it, drawing believers into an unbreakable bond with God.

REFLECTION AND APPLICATION

John 14:20 offers immense comfort, assurance, and a foundational truth for every believer. To truly grasp that Christ dwells within us, and we in Him, transforms our understanding of our identity, purpose, and daily walk. It means we are never alone; the very life and power of God are at work within us through the Holy Spirit. This profound union is the wellspring of spiritual life, enabling us to live righteously, overcome sin, and bear spiritual fruit. It empowers us to face challenges with divine strength, knowing that our sufficiency comes from Christ's indwelling presence. Embracing this truth fosters a deep sense of belonging and security, reminding us that our lives are inextricably intertwined with the life of God Himself. It calls us to live from this reality, allowing Christ's character to be expressed through us in every thought, word, and deed, making our lives a tangible demonstration of His presence.

Questions for Reflection

  • How does the reality of Christ dwelling in you impact your daily life and decisions, particularly when facing challenges or temptations?
  • In what ways can you cultivate a deeper experiential "knowing" of this divine union, moving beyond mere intellectual assent to a lived reality?
  • How does understanding that you are "in Christ" shape your identity and purpose as a believer, and how might this influence your interactions with others?

FAQ

What does "At that day" refer to in John 14:20?

Answer: "At that day" refers to the time period inaugurated by Jesus' resurrection and the subsequent outpouring of the Holy Spirit at Pentecost. Before His death, Jesus' presence with His disciples was physical. After His resurrection and ascension, He promised to send the Holy Spirit, who would mediate His spiritual presence to believers. This "day" marks the transition from Jesus' physical presence to His spiritual indwelling in believers, making the intimate union described in the verse possible and experientially known. This is when the Helper, the Spirit of truth, would come and "abide with you, and shall be in you".

How is the "knowing" in this verse different from intellectual understanding?

Answer: The Greek word for "know" (ginōskō) implies more than just intellectual comprehension or factual knowledge. It refers to an experiential, relational, and intimate understanding, much like knowing a person through a deep relationship. It's a knowledge that transforms and engages the whole person, not just the mind. In the context of John 14:20, it means to experientially grasp and live in the reality of Christ's indwelling and the believer's union with Him, enabled by the Holy Spirit. It's a spiritual revelation that leads to a profound sense of communion and identity.

How does John 14:20 relate to the doctrine of the Trinity?

Answer: John 14:20 is profoundly Trinitarian. It explicitly states "I [am] in my Father," affirming the essential unity and co-inherence (perichoresis) of the Son with the Father. Then, it extends this divine indwelling to believers: "ye in me, and I in you." This implies that through Christ, and by the power of the Holy Spirit (who is sent by both the Father and the Son, as described in John 14:26), believers are brought into a participation in the very life and fellowship of the Triune God. It illustrates how the Father, Son, and Spirit work together to bring about the salvation and spiritual union of believers with God.

CHRIST-CENTERED FULFILLMENT

John 14:20 finds its ultimate fulfillment in the person and work of Jesus Christ, who is the sole mediator enabling this profound spiritual reality. His incarnation, where "the Word was made flesh, and dwelt among us", was the initial step in bridging the gap between God and humanity. Through His sacrificial death on the cross, Jesus atoned for sin, removing the barrier that separated us from God. His resurrection demonstrated His victory over death and inaugurated the new covenant, making possible the indwelling of the Holy Spirit. It is through Christ that we gain "access by one Spirit unto the Father". The promise that "ye in me, and I in you" is realized because Christ, having completed His redemptive work, sent the Spirit to live within believers, making them temples of God (1 Corinthians 6:19). This verse points to the glorious truth that Christ's entire mission was to reconcile us to God, not just externally, but by bringing us into an intimate, indwelling union, where "Christ in you, the hope of glory" becomes our living reality, transforming us from the inside out and guaranteeing our future glorification (Romans 8:9-11).

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Commentary on John 14 verses 18–24

I. II. Main points1. 2. Sub-points(1.) (2.) Details[1.] [2.] Fine details

When friends are parting, it is a common request they make to each other, "Pray let us hear from you as often as you can:" this Christ engaged to his disciples, that out of sight they should not be out of mind.

I. He promises that he would continue his care of them (Joh 14:18): "I will not leave you orphans, or fatherless; for, though I leave you, yet I leave you this comfort, I will come to you." His departure from them was that which grieved them; but it was not so bad as they apprehended, for it was neither total nor final. 1. Not total. "Though I leave you without my bodily presence, yet I do not leave you without comfort." Though children, and left little, yet they had received the adoption of sons, and his Father would be their Father, with whom those who otherwise would be fatherless find mercy. Note, The case of true believers, though sometimes it may be sorrowful, is never comfortless, because they are never orphans: for God is their Father, who is an everlasting Father. 2. Not final: I will come to you, erchomai - I do come; that is, (1.) "I will come speedily to you at my resurrection, I will not be long away, but will be with you again in a little time." He had often said, The third day I will rise again. (2.) "I will be coming daily to you in my Spirit;" in the tokens of his love, and visits of his grace, he is still coming. (3.) "I will come certainly at the end of time; surely I will come quickly to introduce you into the joy of your Lord." Note, The consideration of Christ's coming to us saves us from being comfortless in his removals from us; for, if he depart for a season, it is that we may receive him for ever. Let this moderate our grief, The Lord is at hand.

II. He promises that they should continue their acquaintance with him and interest in him (Joh 14:19, Joh 14:20): Yet a little while, and the world sees me no more, that is, Now I am no more in the world. After his death, the world saw him no more, for, though he rose to life, he never showed himself to all the people, Act 10:41. The malignant world thought they had seen enough of him, and cried, Away with him; crucify him; and so shall their doom be; they shall see him no more. Those only that see Christ with an eye of faith shall see him for ever. The world sees him no more till his second coming; but his disciples have communion with him in his absence.

1.You see me, and shall continue to see me, when the world sees me no more. They saw him with their bodily eyes after his resurrection, for he showed himself to them by many infallible proofs, Act 1:8. And then were the disciples glad when they saw the Lord. They saw him with an eye of faith after his ascension, sitting at God's right hand, as Lord of all; saw that in him which the world saw not.

2.Because I live, you shall live also. That which grieved them was, that their Master was dying, and they counted upon nothing else but to die with him. No, saith Christ, (1.) I live; this the great God glories in, I live, saith the Lord, and Christ saith the same; not only, I shall live, as he saith of them, but, I do live; for he has life in himself, and lives for evermore. We are not comfortless, while we know that our Redeemer lives. (2.) Therefore you shall live also. Note, The life of Christians is bound up in the life of Christ; as sure and as long as he lives, those that by faith are united to him shall live also; they shall live spiritually, a divine life in communion with God. This life is hid with Christ; if the head and root live, the members and branches live also. They shall live eternally; their bodies shall rise in the virtue of Christ's resurrection; it will be well with them in the world to come. It cannot but be well with all that are his, Isa 26:19.

3.You shall have the assurance of this (Joh 14:20): At that day, when I am glorified, when the Spirit is poured out, you shall know more clearly and certainly than you do now that I am in my Father, and you in me, and I in you. (1.) These glorious mysteries will be fully known in heaven; At that day, when I shall receive you to myself, you shall know perfectly that which now you see through a glass darkly. Now it appears not what we shall be, but then it will appear what we were. (2.) They were more fully known after the pouring out of the Spirit upon the apostles; at that day divine light should shine, and their eyes should see more clearly, their knowledge should greatly advance and increase then, would become more extensive and more distinct, and like the blind man's at the second touch of Christ's hand, who at first only saw men as trees walking. (3.) They are known by all that receive the Spirit of truth, to their abundant satisfaction, for in the knowledge of this is founded their fellowship with the Father and his Son Jesus Christ. They know, [1.] That Christ is in the Father, is one with the Father, by their experience of what he has wrought for them and in them; they find what an admirable consent and harmony there is between Christianity and natural religion, that that is grafted into this, and so they know that Christ is in the Father. [2.] That Christ is in them; experienced Christians know by the Spirit that Christ abides in them, Jo1 3:24. [3.] That they are in Christ, for the relation is mutual, and equally near on both sides, Christ in them and they in Christ, which speaks an intimate and inseparable union; in the virtue of which it is that because he lives they shall live also. Note, First, Union with Christ is the life of believers; and their relation to him, and to God through him, is their felicity. Secondly, The knowledge of this union is their unspeakable joy and satisfaction; they were now in Christ, and he in them, but he speaks of it as a further act of grace that they should know it, and have the comfort of it. An interest in Christ and the knowledge of it are sometimes separated.

III. He promises that he would love them, and manifest himself to them, Joh 14:21-24. Here observe,

1.Who they are whom Christ will look upon, and accept, as lovers of him; those that have his commandments, and keep them. By this Christ shows that the kind things he here said to his disciples were intended not for those only that were now his followers, but for all that should believe in him through their word. Here is, (1.) The duty of those who claim the dignity of being disciples. Having Christ's commandments, we must keep them; as Christians in name and profession we have Christ's commandments, we have them sounding in our ears, written before our eyes, we have the knowledge of them; but this is not enough; would we approve ourselves Christians indeed, we must keep them. Having them in our heads, we must keep them in our hearts and lives. (2.) The dignity of those that do the duty of disciples. They are looked upon by Christ to be such as love him. Not those that have the greatest wit and know how to talk for him, but those that keep his commandments. Note, The surest evidence of our love to Christ is obedience to the laws of Christ. Such is the love of a subject to his sovereign, a dutiful, respectful, obediential love, a conformity to his will, and satisfaction in his wisdom.

2.What returns he will make to them for their love; rich returns; there is no love lost upon Christ. (1.) They shall have the Father's love: He that loveth me shall be loved of my Father. We could not love God if he did not first, out of his good-will to us, give us his grace to love him; but there is a love of complacency promised to those that do love God, Pro 8:17. He loves them, and lets them know that he loves them, smiles upon them, and embraces them. God so loves the Son as to love all those that love him. (2.) They shall have Christ's love: And I will love him, as God-man, as Mediator. God will love him as a Father, and I will love him as a brother, an elder brother. The Creator will love him, and be the felicity of his being; the Redeemer will love him, and be the protector of his well-being. In the nature of God, nothing shines more brightly than this, that God is love. And in the undertaking of Christ nothing appears more glorious than this, that he loved us. Now both these loves are the crown and comfort, the grace and glory, which shall be to all those that love the Lord Jesus Christ in sincerity. Christ was now leaving his disciples, but promises to continue his love to them; for he not only retains a kindness for believers, though absent, but is doing them kindness while absent, for he bears them on his heart, and ever lives interceding for them. (3.) They shall have the comfort of that love: I will manifest myself to him. Some understand it of Christ's showing himself alive to his disciples after his resurrection; but, being promised to all that love him and keep his commandments, it must be construed so as to extend to them. There is a spiritual manifestation of Christ and his love made to all believers. When he enlightens their minds to know his love, and the dimensions of it (Eph 3:18, Eph 3:19), enlivens their graces, and draws them into exercise, and thus enlarges their comforts in himself - when he clears up the evidences of their interest in him, and gives them tokens of his love, experience of his tenderness, and earnests of his kingdom and glory, - then he manifests himself to them; and Christ is manifested to none but those to whom he is pleased to manifest himself.

3.What occurred upon Christ's making this promise.

(1.)One of the disciples expresses his wonder and surprise at it, Joh 14:22. Observe, [1.] Who it was that said this - Judas, not Iscariot. Judah, or Judas, was a famous name; the most famous tribe in Israel was that of Judah; two of Christ's disciples were of that name: one of them was the traitor, the other was the brother of James (Luk 6:16), one of those that were akin to Christ, Mat 13:55. He is called Lebbeus and Thaddeus, was the penman of the last of the epistles, which in our translation, for distinction's sake, we call the epistle of Jude. This was he that spoke here. Observe, First, There was a very good man, and a very bad man, called by the same name; for names commend us not to God, nor do they make men worse. Judas the apostle was never the worse, nor Judas the apostate ever the better, for being namesakes. But, Secondly, The evangelist carefully distinguishes between them; when he speaks of this pious Judas, he adds, not Iscariot. Take heed of mistaking; let us not confound the precious and the vile. [2.] What he said - Lord how is it? which intimates either, First, the weakness of his understanding. So some take it. He expected the temporal kingdom of the Messiah, that it should appear in external pomp and power, such as all the world would wonder after. "How, then," thinks he, "should it be confined to us only?" ti gegonen - "what is the matter now, that thou wilt not show thyself openly as is expected, that the Gentiles may come to thy light, and kings to the brightness of thy rising?" Note, We create difficulties to ourselves by mistaking the nature of Christ's kingdom, as if it were of this world. Or, Secondly, as expressing the strength of his affections, and the humble and thankful sense he had of Christ's distinguishing favours to them: Lord, how is it? He is amazed at the condescensions of divine grace, as David, Sa2 7:18. What is there in us to deserve so great a favour? Note, 1. Christ's manifesting himself to his disciples is done in a distinguishing way - to them, and not to the world that sits in darkness; to the base, and not to the mighty and noble; to babes, and not to the wise and prudent. Distinguishing favours are very obliging; considering who are passed by, and who are pitched upon. 2. It is justly marvellous in our eyes; for it is unaccountable, and must be resolved into free and sovereign grace. Even so, Father, because it seemed good unto thee.

(2.)Christ, in answer hereto, explains and confirms what he had said, Joh 14:23, Joh 14:24. He overlooks what infirmity there was in what Judas spoke, and goes on with his comforts.

[1.]He further explains the condition of the promise, which was loving him, and keeping his commandments. And, as to this, he shows what an inseparable connection there is between love and obedience; love is the root, obedience is the fruit. First, Where a sincere love to Christ is in the heart, there will be obedience: "If a man love me indeed, that love will be such a commanding constraining principle in him, that, no question, he will keep my words." Where there is true love to Christ there is a value for his favour, a veneration for his authority, and an entire surrender of the whole man to his direction and government. Where love is, duty follows of course, is easy and natural, and flows from a principle of gratitude. Secondly, On the other hand, where there is no true love to Christ there will be no care to obey him: He that loveth me not keepeth not my sayings, Joh 14:24. This comes in here as a discovery of those that do not love Christ; whatever they pretend, certainly those do not love him that believe not his truths, and obey not his laws, to whom Christ's sayings are but as idle tales, which he heeds not, or hard sayings, which he likes not. It is also a reason why Christ will not manifest himself to the world that doth not love him, because they put this affront upon him, not to keep his sayings; why should Christ be familiar with those that will be strange to him?

[2.]He further explains the promise (Joh 14:23): If a man thus love me, I will manifest myself to him. First, My Father will love him; this he had said before (Joh 14:21), and here repeats it for the confirming of our faith; because it is hard to imagine that the great god should make those the objects of his love that had made themselves vessels of his wrath. Jude wondered that Christ should manifest himself to them; but this answers it, "If my Father love you, why should not I be free with you?" Secondly, We will come unto him, and make our abode with him. This explains the meaning of Christ's manifesting himself to him, and magnifies the favour. 1. Not only,I will, but, We will, I and the Father, who, in this, are one. See Joh 14:9. The light and love of God are communicated to man in the light and love of the Redeemer, so that wherever Christ is formed the image of God is stamped. 2. Not only, "I will show myself to him at a distance," but, "We will come to him, to be near him, to be with him," such are the powerful influences of divine graces and comforts upon the souls of those that love Christ in sincerity. 3. Not only, "I will give him a transient view of me, or make him a short and running visit," but, We will take up our abode with him which denotes complacency in him and constancy to him. God will not only love obedient believers, but he will take a pleasure in loving them, will rest in love to them, Zep 3:17. He will be with them as at his home.

[3.]He gives a good reason both to bind us to observe the condition and encourage us to depend upon the promise. The word which you hear is not mine, but his that sent me, Joh 14:24. To this purport he had often spoken (Joh 7:16; Joh 8:28; Joh 12:44), and here it comes in very pertinently. First, the stress of duty is laid upon the precept of Christ as our rule, and justly, for that word of Christ which we are to keep is the Father's word, and his will the Father's will. Secondly, The stress of our comfort is laid upon the promise of Christ. But forasmuch as, in dependence upon that promise, we must deny ourselves, and take up our cross, and quit all, it concerns us to enquire whether the security be sufficient for us to venture our all upon; and this satisfies us that it is, that the promise is not Christ's bare word, but the Father's which sent him, which therefore we may rely upon.

Matthew Henry (1662–1714) — Commentary on the Whole Bible. This section covers verses 18–24. Public domain.
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Aphrahat the Persian SageAD 345
DEMONSTRATION 4.11
When someone sweeps clean their soul in the name of Christ, Christ dwells in them and God dwells in Christ. From that time onward, that person becomes one of three persons—himself; Christ, who dwells in him; and God, who dwells in Christ.
Hilary of PoitiersAD 367
ON THE TRINITY 8.15
If he wished to indicate a mere unity of will, why did he set forth a kind of gradation and sequence in the completion of the unity, unless it were that, since he was in the Father through the nature of deity and we on the contrary are in him through his birth in the body, he would have us believe that he is in us through the mystery of the sacraments? And thus there might be taught a perfect unity through a mediator while, we abiding in him, he abode in the Father and as abiding in the Father abode also in us. In this way we might arrive at unity with the Father, since in him who dwells naturally in the Father by birth, we also dwell naturally while he himself abides naturally in us also.
Hilary of Poitiers (as quoted by Aquinas, AD 1274)AD 367
Catena Aurea by Aquinas
(viii. de Trin) Or He means by this, that whereas He was in the Father by the nature of His divinity, and we in Him by means of His birth in the flesh; He on the other hand should be believed to be in us by the mystery of the Sacrament: as He Himself testified above: Whoso eateth My flesh, and drinketh My blood, dwelleth in Me, and I in Him. (supr. 6:54)
John Chrysostom (as quoted by Aquinas, AD 1274)AD 407
Catena Aurea by Aquinas
(Hom. lxxv. 2) Or, in that day, on which I shall rise again, ye shall know. For His resurrection it was that established their faith. Then the powerful teaching of the Holy Spirit began. His saying, I am in the Father, expresses His humility; the next, And ye in Me, and I in you, His humanity and God's assistance to Him. Scripture often uses the same words in different senses, as applied to God and to men.
Theodore of MopsuestiaAD 428
COMMENTARY ON JOHN 6.14.20
Then, he says, from these facts only you will learn that what I said to you was true about which you now have your doubts. I said, “I am in my Father” concerning the equality of nature and the inseparable connection when I will appear so. And I said “you are in me” concerning your faith and love for me when you will be made a participant with me in charity and also in the gift of the Spirit. “And I in you” is said with reference to what the close connection will cause when, after being regenerated by the power of the Spirit, you are with me in the body and I am with you in the head.
Augustine of Hippo (as quoted by Aquinas, AD 1274)AD 430
Catena Aurea by Aquinas
It follows: In that day (the day of which He saith, ye shall live also) ye shall know, i. e. whereas now ye believe, then ye shall see, that I am in the Father, and ye in Me, and I in you. For when we shall have attained to that life in which death is swallowed up, then shall be finished that which is now begun by Him, that He should be in us, and we in Him.
Augustine of HippoAD 430
Tractates on John 75
"In that day," He says, "ye shall know that I am in my Father, and ye in me, and I in you." In what day, but in that whereof He said, "Ye shall live also"? For then will it be that we can see what we believe. For even now is He in us, and we in Him: this we believe now, but then shall we also know it; although what we know even now by faith, we shall know then by actual vision. For as long as we are in the body, as it now is, to wit, corruptible, and encumbering to the soul, we live at a distance from the Lord; for we walk by faith, not by sight. Then accordingly it will be by sight, for we shall see Him as He is. For if Christ were not even now in us, the apostle would not say, "And if Christ be in you, the body is dead indeed because of sin; but the spirit is life because of righteousness." But that we are also in Him even then, He makes sufficiently clear, when He says, "I am the vine, ye are the branches." Accordingly in that day, when we shall be living the life, whereby death shall be swallowed up, we shall know that He is in the Father, and we in Him, and He in us; for then shall be completed that very state which is already in the present begun by Him, that He should be in us, and we in Him.
Cyril of AlexandriaAD 444
Commentary on the Gospel of John, Book 9
If it is merely because he loves and is loved that the Son is in God the Father, and if by the same law we are in the Son and he in us, and no different bond of union is discernible—whether we consider that which binds the Son to the Father or us to him and him to us—then in what sense, or on what principle, I ask you, does Jesus say that “in that day” we shall know the mystery of this?…“For in that day you shall know,” he says, “that I am in the Father, and you are in me, and I am in you.” For I myself live, he says, for I am life by nature and have shown the temple of my own body alive. But when you yourselves (albeit you are of a corruptible nature) also behold yourselves living in a similar way as I do, then indeed you shall know very clearly that I, being life by nature, knitted you through myself into God the Father, who is also himself life by nature, making you partakers as it were and sharers in his incorruption. For I am in the Father naturally, being the fruit of his essence and its real offspring, subsisting in it, having shone forth from it. I am life of life, and you are in me and I in you, forasmuch as I appeared as a man myself and made you partakers of the divine nature by having my Spirit dwell in you. For Christ is in us through the Spirit, converting that which has a natural tendency to corruption into incorruption and transferring it from the condition of dying to that which is otherwise. And so Paul also says that “he who raised Jesus Christ from the dead shall enliven also your mortal bodies through his Spirit that dwells in you.” For albeit the Holy Spirit proceeds from the Father, yet he comes through the Son and is his own. For all things are through the Son from the Father. The divine psalmist will testify that it was through the Spirit that we were recreated for eternal life when he cries as one speaking to the God of all …, “You shall take away their breath and they shall fail and shall turn again to their dust. You shall send forth your Spirit, and they shall be made, and you shall renew the face of the earth. Do you hear how the transgression that was in Adam and the “turning away” from the divine commandments, troubled the nature of humanity and made it return to its own earth? But when God sent forth his Spirit and made us partakers of his own nature and through him renewed the face of the earth, we were transfigured to “newness of life,” casting off the corruption that comes with sin and once more grasping eternal life through the grace and love toward the human race that our Lord Jesus Christ has.
Cyril of AlexandriaAD 444
Commentary on the Gospel of John, Book 9
The meaning of the passage before us is somewhat hard to reach, and as it were demands that the inquiry applied to it be keen, and imposes very considerable delay on our discourse: howbeit we believe that Christ will once more direct us into truth. Now some, albeit among the number of those once supposed among the impious heretics to be of eminence, refusing malignantly to confess that the Son is of the essence of God the Father, and is therefore in Him, conceive that the union is an accidental one and not one of nature; and in fact they have written----belching forth thereby what proceeds from their own minds, not from the Holy Spirit----that, forasmuch as the Son is loved by the Father, and Himself loves the Father in return, it is after this sort that He is in Him. And these demented men bring as a proof hard to overthrow, the words attached to the clause before us, to wit concerning us and Him; and indeed they say, resting withal their blasphemies on the staff of a reed, that as we are said to be in Him, and have Him in ourselves, and are not united to Him in the matter of our essence, but the manner of the union is determined by our capacity to love and be loved in return; so the Son also, one of them would say, is not at all within the essence of God the Father, but being wholly distinct in the matter of His nature, and being quite differently characterised, is understood to be in the Father solely by virtue of the law of love. For it is their aim, as we said just now, to show that the Only-begotten is an effect and a creature, and produced and honoured merely with His preeminence over the rest of the creatures, notwithstanding He is external to the essence of God the Father.

But forasmuch as concerning this we have already spoken at length, assaying thereby to show to the best of our power, that the Son is by nature in the Father and that the union which He has with Him is substantial, we will forbear further for the present to extend our remarks touching this subject. Howbeit we will not wholly leave as it were the ground of the argument clear for our opponents to overrun, but will set the battle in array against them in a few words, exhibiting so far as possible at once the mischief and the ignorance of their wicked and loathsome artifice; and particularly we will say: If it is solely by reason that He is loved and loves that the Son is in the Father, and if by the same law we are in Him and He in us, and no different bond of union is discernible, whether we consider that which binds the Son to the Father, or us to Him and Him to us: in what sense or on what principle, I pray you, does He say that it is in that day we shall know the mystery of this? For seemingly we do not yet know that the Father loves the Son, and the Son also loves the Father; nor, I suppose, do we yet know our own condition, but a vain calculation mocks us, when we think that the Son loved us, and for this cause won us unto the Father, and that we also loved Him! For when He says In that day ye shall know, He shows that the time of the knowledge is not yet present; then, why did the Lord all in vain make our ears ring with His words: The Father loveth the Son? For that He Himself loves the Father, who will deny? And how, I pray you, said He also that His choosing to suffer in our behalf was a clear proof of His love to us-ward? For greater love hath no man than this, He says, that a man lay down His life for His friends. And why did He manifestly seek for love from us towards Himself, and that for this cause we should be eager to fulfil His good pleasure? For he that loveth Me, He says, will keep My commandments. For when shall we keep the Divine commandment, if at the present we make no account thereof? Forasmuch then as it is fit we believe that the Son loves the Father, and loves us and is beloved by us, how is it not consistent to conceive that the Son has purposed to signify something diverse from this, and not to define the manner of the union by the law of love; or rather that He has manifestly introduced it to us as after some different sort, when He says: In that day ye shall know that I am in My Father and ye in Me and I in you. But peradventure the opponent will answer, that before the Passion Christ said such things as these to us, to wit that He loves the Father and is loved again by the Father, and He loves us also and we Him; but that after the Passion and the Revival from the dead, when we saw that He burst the bonds of death, we learnt that He is in the Father, forasmuch as also He is loved, and for this cause rose from the dead. For this cause also He is in us and we in Him, according to the same law of love.

But we reply: Your opposition is exceeding idle, and wholly without understanding, and a tissue of rotten words. But, excellent Sirs, consider once more that what we knew of a truth before the Resurrection from the dead, there was no need to learn after the Resurrection. For if it was only imperfectly that we believed that the Son is loved of His own Father, and Himself loves the Father, it was indeed necessary to await the Resurrection, with intent we might therefrom have the perfection of knowledge. But if the Father be worthy of belief when He says even before the Resurrection: He is My beloved Son; and if the Saviour Himself also speaks true when He says: The Father loveth the Son; and if the law of love is fittingly to be conceived in its entire perfection; why do ye foolishly strike at us with hard words? And why, thrusting aside the beauty of the Truth, do ye fashion you an unsightly lie, dragging outside of the Father's essence the Son that is of Him and through Him, and withal inventing right rotten words, and contriving tricks of absurd argumentation? For that the Only-begotten loved us, and that we also loved Him, will be open to any one to see with utmost readiness, so he be willing to regard intently the nature of the truth: For being in the form of God the Father, He counted it not a prize to be on an equality with God, but emptied Himself, taking the form of a servant. Then what, I pray you, was the ground of such actions? Was it not the law of love towards us? And how is it possible to doubt? And our willingness too on behalf of Christ and readiness to abandon our very life to the persecutors, that we may not deny our own Lord, will it not supply proof to demonstration of our love to Him? But a man will also say that this either is entirely true, or will condemn the Holy Martyrs as having wrought a desperate struggle for Christ for no useful end, and endured so grievous a danger all unrecompensed. So then, whereas it is proved with all clearness that the Father has towards the Son love in perfection, and that in like sort also He loves the Father, and we Him and He us, what reason could there be in supposing that the discernment thereof is referred perchance to other times, when the Lord says: In that day ye shall know that I am in the Father, and ye in Me, and I in you.

For away with their idle talkings and the pretentiousness of their God-hating speculations! But we waxing bold in the consciousness of bearing the torch of the Spirit, will not hesitate to say what seems to be right, with intent to clear up the questions at issue. So then, having said above: Because I live ye shall live also, straightway He is found to have added: In that day ye shall know that I am in My Father, and ye in Me, and I in you. Then to what man, upright and wont to think rightly, would it not be abundantly clear, that He limits a day, the time to wit of the knowledge hereof, upon which we ourselves also, renovated after His likeness, shall ascend unto eternal life, escaping from the curse of death? And something after this sort the Christ-bearer seems to me to indicate----I mean, Paul----when, revealing to us the Divine Mystery, he writes to some: For ye died and your life is hid with Christ in God; when then Christ, which is your life, shall appear, then shall ye also appear with Him in glory. For He shall transform the body of our humiliation----this body assuredly, and not a diverse----to be conformable unto His glory, and shall transmute the nature of man unto the ancient type with power unspeakable, changing all things easily unto whatsoever He will, none forbidding; for He is very God That maketh all things and changeth the fashion of them, as it is written. So then at that day, or time, when ye also yourselves shall live----for I do live, albeit made man like unto you, and clad with the body which as touching its proper nature is subject to corruption----ye shall recognise clearly, He says, that I am in the Father, and ye in Me, and I in you. And we shall be disposed to think that the Lord said this unto us, not with intent we might suppose that He is in the Father according to the law of love, as indeed our opponents thought fit to believe, but according to the power of a deep mystery, which is also both difficult to conceive, and hard to utter; howbeit I will essay how I may be able to expound it.

Now I hold that the mind of any man on earth is very far from equal to the accurate exposition hereof; notwithstanding, in the fervour of love, albeit with powers of sight and utterance but little whetted, let us now consider the aim of the Incarnation of the Only-begotten. Let us, I pray you, examine the cause, wherefore, being as God in the form of God the Father, He counted it not a prize to be on an equality with God, but emptied Himself, taking the form of a servant, and endured the cross despising the shame. For in this way the depth of the mysteries before us will be manifest, so far as is possible, howbeit hardly so. But we shall learn how the Son is in the Father, naturally, that is, and not by virtue of the relation of being loved and loving as invented by our opponents; and we again in Him after the same sort, and He in us. Well then, one cause the wise Paul expounded was a true and most general cause of the Incarnation of the Only-begotten, when he said: For God the Father was pleased to gather together in one all things in Christ; and "gathering in one," both the name and the thing, plainly involves the bringing back again and resumption of the things that have digressed to an unconformable end unto what they were in the beginning. Then desiring to put before us in a clear light the methods of the gathering in detail, at one time he said: For what the Law could not do, in that it was weak through the flesh, God, sending His own Son in the likeness of sinful flesh and as an offering for sin, condemned sin in the flesh: that the ordinance of the Law might be fulfilled in us, who walk not after the flesh, but after the Spirit; and at another again: Since then the children are sharers in flesh and blood, He also Himself in like manner partook of the same; that through death He might bring to nought him that had the power of death, that is the devil; and might deliver all them who through fear of death were all their lifetime subject to bondage. And herein we have two methods of the gathering together which Paul expounded the doctrine of the Incarnation of the Only-begotten as of necessity involving; but a further method, inclusive of the others, was set forth by the wise Evangelist John. For he writes thus touching Christ: He came unto His own, and they that were His own received Him not. But as many as received Him, to them gave He the right to become children of God, even to them that believe on His Name: which were born not of blood, nor of the will of the flesh, nor of the will of man, but of God. So then it is abundantly evident and manifest I conceive unto all, that it was for these causes especially that, being by nature God and of God, the Only-begotten has become man; namely with intent to condemn sin in the flesh, and by His own Death to slay Death, and to make us Sons of God, regenerating in the Spirit them that are on earth unto supernatural dignity. For it was, I trow, exceeding good, after this sort to gather together again into one and to recover unto the ancient estate the sore-stumbled race, to wit, the human. Again, let us set each of the causes just given side by side with the Lord's saying, and thereupon make such remarks that seem fit. For we must inquire in what sense it may be seemly to conceive that God the Father condemned sin in the flesh by sending His own Son in likeness of sinful flesh. For albeit the Son were by nature God and had shone forth from His essence and possessed naturally the immutability of His proper being, and for this cause in no wise could stumble into sin, or turn aside anywhither into what is not right, the Father caused him voluntarily to descend into the flesh that is subject to sin, with intent that making very flesh His own, He might bring it over unto His own natural property, to wit, sinlessness. For, I conceive, we shall not be right in believing that it was with intent to effect this for the Temple of His own Body alone that the Only-begotten has been made man; for where were the glory and profit of His Advent unto us to be seen, if He accomplished the salvation of His own Body alone? But we believe rather that it was to secure the benefits for all nature through Himself and in Himself first as in the firstfruits of humanity, that the Only-begotten has become like us. For like as we have followed after not only death but all the sufferings of the flesh, undergoing this suffering in the first man by reason as well of the transgression as of the divine curse; after the same sort, I conceive, shall we all of us follow Christ, as He saves in many ways and sanctifies the nature of the flesh in Himself. Wherefore also Paul said: And as we love the image of the earthy, we shall bear also the image of the heavenly. For the image of the earthy, to wit of Adam, is to be in sufferings and corruption; and the image of the heavenly, to wit of Christ, is to be in impassibility and incorruption. So then the Word being God by nature condemned sin in His own flesh, by charging it to cease its activity, or rather so amending it as that it should move after the good pleasure of God, and no longer at its own will; and so whereas the body was natural, He made it spiritual. This then is one method of the gathering together; but the method that is most befitting and appropriate to the drift of the passage before us shall follow it. And it will be our task to speak touching eternal life and the slaying of Death, and how the Only-begotten removed from human nature the corruption that came of the transgression. Therefore forasmuch as the children are partakers of blood and flesh, He also in like manner took part in the same with intent to slay Death, and that He that created all things unto immortality and made the generations of the world healthful, according as it is written, might remould once more the fashion of things unto their ancient estate.

And once again, albeit my argument be more minute than behoves, yet, as it needs must, it shall proceed, setting forth the ancient condition of our estate. For I conceive the sincere purpose to grasp the meaning of the words before us, will wholly escape the dangers that come of mere loitering. So then this rational creature upon earth, I mean man, was made from the beginning after the image of Him that created him, according to the Scriptures; and the meaning of image is various. For an image may be, not after one sort, but after many; howbeit the element of the likeness to God that made him, which is far the most manifest of all, was his incorruptibility and indestructibility. But never, I conceive, would the creature have been sufficient unto himself to be so, merely by virtue of the law of his own nature; for how could he that is of the earth in his own nature have been shown to possess the glory of incorruption, unless it were from the God that is by nature both incorruptible and indestructible and ever the same, that he was enriched with this boon in like manner as with all others? For what hast thou that thou didst not receive? saith somewhere unto us the inspired Paul, with exceeding reason and truth. With intent then that what was once brought into being out of that which is not, might not, by sinking back to its own original, once more vanish into nothing, but rather be preserved evermore----for this was the aim of Him that created it----God makes it partaker of His own nature. For He breathed into his face the breath of life, i.e. the Spirit of the Son, for He is Himself the Life with the Father, holding all things together in being. For the things that are receptive of life both move in Him and live, according to the words of Paul.

And let none of us found hereupon any words of false teaching, by supposing that we said that the Divine inbreathing has become a soul unto the living creature; for this we deny, guided unto the truth of the matter by such reasoning as this. If any suppose that the Divine inbreathing became a soul, let him tell us whether it was turned aside from its own nature and has been made into a soul, or has it remained in its own identity? For if they say it has been on anywise changed and that it traversed the law of its own nature, they will be convicted of blasphemy; for they will say that the immutable and ever-unchanging Nature is altogether mutable; whereas if it was in no wise turned aside, but has ever remained what it always was, after coming forth from God, to wit His inbreathing, how did it deflect unto sin, and become susceptible of so great diversity of passions? For, I trow, they would not say that there is, in anywise, in the Divine Nature the possibility of transgression. But to get over the words due to the subject before us without using lengthy proofs, I say we must repeat this once again and say,----that no one, I imagine, rightly minded would suppose that the Breath which proceeded from the Divine Essence became the creature's soul, but that after the creature was ensouled, or rather had attained unto the propriety of its perfect nature by means of both, soul and body to wit, then like a stamp of His own Nature the Creator impressed on it the Holy Spirit, i. e. the Breath of Life, whereby it became moulded unto the archetypal Beauty, and completed after the image of Him that created it, enabled unto every form of excellence, by virtue of the Spirit given to dwell in it. But whereas, being free of will, and entrusted with the reins of its own purposes----for this also is an element in the image, forasmuch as God has power over His own purposes----it turned and has fallen----but how this came to pass the Holy Scripture must teach you, for the account of it therein is plain----God the Father both determined and took in hand to gather together once more in Christ the nature of man unto its ancient estate, and willing it accomplished it withal. So then it naturally follows that we should observe how it has come to pass. It was not otherwise possible for man, forasmuch as he was of a nature that was perishing, to escape death, save by recovering that ancient grace, and partaking once more in God Who holdeth all things together in being and preserveth them in life through the Son in the Spirit. Therefore He hath become partaker of blood and flesh, i.e. He hath become man, being by nature Life, and begotten of the Life that is by nature, i.e. of God the Father----to wit, His Only-begotten Word, with intent that ineffably and inexpressibly and as He alone could skill to do, uniting Himself with the flesh that by the law of its own nature was perishing, He might bring it back unto His own Life and make it through Himself partaker of God the Father. For He is Mediator between God and men, according as it is written, knit unto God the Father naturally as God and of Him, and again unto men as man; and withal having in Himself the Father and being Himself in the Father; for He is the impress and effulgence of His Person, and not distinct from the Essence, whereof He is impress and wherefrom He proceeds as effulgence; but both being Himself in It, and having It in Himself; and again having us in Himself according as He wears our nature and our body has become entitled the Body of the Word. For the Word was made flesh, according to the utterance of John. And He wears our nature, remoulding it unto His own Life. And He is also Himself in us; for we have all been made partakers of Him, and have Him in ourselves through the Spirit; for, for this cause we have Both, being made partakers of the Divine Nature, and are entitled sons, after this sort having in us also the Father Himself through the Son. And Paul will testify hereof where he says: Because ye are sons God sent forth the Spirit of His Son into your hearts, crying, Abba, Father. For His Spirit is not something diverse from the Son, I mean as touching the law of identity, to wit, identity of nature.

This being the result of the progress of our discourse of these things, let us now take the meaning of what has been set forth, and adapt it to the interpretation of our Saviour's words: For in that day ye shall know, He says, that I am in the Father, and ye in Me, and I in you. For I live Myself, He says, for I am Life by nature, and have shown the Temple of My own Body alive; but when ye also yourselves, albeit ye are of a corruptible nature, shall behold yourselves living in like manner as I do, then indeed ye shall know exceeding clearly, that I, being Life by nature, did knit you through Myself unto God the Father, Who is also Himself by nature Life, making you partakers as it were and sharers in His Incorruption. For naturally am I in the Father----for I am the Fruit of His Essence and Its real Offspring, subsisting in It, having shone forth from It, Life of Life----and ye are in Me and I in you, forasmuch as I appeared as a man Myself, and made you partakers of the Divine Nature by putting My Spirit to dwell in you. For Christ is in us through the Spirit, converting that which has a natural tendency to corruption into incorruption, and transferring it from the condition of dying unto that which is otherwise. Wherefore also Paul says that He that raised Jesus Christ from the dead, shall quicken also your mortal bodies, through His Spirit that dwelleth in you. For albeit the Holy Spirit proceeds from the Father, yet He comes through the Son, and is His Own; for all things are through the Son from the Father. For that it was through the Spirit we were wrought anew unto eternal life, the Divine Psalmist will bear us record, when he cries as unto the God of all: When Thou openest Thine Hand, all things shall be filled with goodness; when Thou turnest away Thy Face they shall be troubled; Thou shalt take away their breath and they shall fail and shall turn again to their dust. Thou shalt send forth Thy Spirit and they shall be made, and Thou shalt renew the face of the earth. Hearest thou how the transgression that was in Adam, and the "turning away" as it were from the Divine precepts, sore troubled the nature of man, and made it return to its own earth? But when God sent forth His Spirit, and made us partakers of His own Nature, and through Him renewed the face of the earth, we were transfigured unto newness of life, casting off the corruption that comes of sin, and once more grasping eternal life, through the grace and love towards mankind of our Lord Jesus Christ, through Whom and with Whom unto God the Father, be glory with the Holy Spirit unto the ages. Amen.
Alcuin of York (as quoted by Aquinas, AD 1274)AD 804
Catena Aurea by Aquinas
By love, and the observance of His commandments, that will be perfected in us which He has begun, viz. that we should be in Him, and He in us. And that this blessedness may be understood to be promised to all, not to the Apostles only, He adds, He that hath My commandments and keepeth them, he it is that loveth Me.
Source: Quotations drawn from early Church Fathers and historical Christian theologians (AD 100–1500). Some quotes address the surrounding passage context rather than this verse alone.
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