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John 17:19

And for their sakes I sanctify myself, that they also might be sanctified through the truth.

But since, on the ground that the Mediator between God and men, the man Christ Jesus, has become Head of the Church, they are His members; therefore He says in the words that follow, "And for their sakes I sanctify myself." For what means He by the words, "And for their sakes I sanctify myself," but I sanctify them in myself, since they also are [part of] myself? For those of whom He so speaks are, as I have said, His members; and the head and body are one Christ, as the apostle teaches when he says of the seed of Abraham, "And if ye be Christ's, then are ye Abraham's seed," after having said before, "He saith not, And to seeds, as in many, but as in one, And to thy seed, which is Christ." If, then, the seed of Abraham is Christ, what else is declared to those to whom he says, "Then are ye Abraham's seed," but then are ye Christ? Of the same character is what this very apostle said in another place: "Now I rejoice in my sufferings for you, and fill up that which is lacking of the afflictions of Christ in my flesh." He said not, of my afflictions, but "of Christ's;" for he was a membe…
But since, on the ground that the Mediator between God and men, the man Christ Jesus, has become Head of the Church, they are His members; therefore He says in the words that follow, "And for their sakes I sanctify myself." For what means He by the words, "And for their sakes I sanctify myself," but I sanctify them in myself, since they also are [part of] myself? For those of whom He so speaks are, as I have said, His members; and the head and body are one Christ, as the apostle teaches when he says of the seed of Abraham, "And if ye be Christ's, then are ye Abraham's seed," after having said before, "He saith not, And to seeds, as in many, but as in one, And to thy seed, which is Christ." If, then, the seed of Abraham is Christ, what else is declared to those to whom he says, "Then are ye Abraham's seed," but then are ye Christ? Of the same character is what this very apostle said in another place: "Now I rejoice in my sufferings for you, and fill up that which is lacking of the afflictions of Christ in my flesh." He said not, of my afflictions, but "of Christ's;" for he was a member of Christ, and in his persecutions, such as it behoved Christ to suffer in the whole of His body, he also was filling up his own share of His afflictions. And to be assured of the certainty of this in the present passage, give heed to what follows. For after saying, "And for their sakes I sanctify myself," to let us understand that He thereby meant that He would sanctify them in Himself, He immediately added, "That they also may be sanctified in the truth." And what else is this but in me, in accordance with the fact that the truth is that Word in the beginning which is God? In whom also the Son of man was Himself sanctified from the beginning of His creation, when the Word was made flesh, for the Word and the man became one person. Then accordingly He sanctified Himself in Himself, that is, Himself the man in Himself the Word; for the Word and the man is one Christ, who sanctifies the manhood in the Word. But in behalf of His members He says, "And for their sakes I,"-that is, that the benefit may be also theirs, for they too are [included in the] I, just as it benefited me in myself, because I am man apart from them-" I sanctify myself," that is, I sanctify them as if it were my own self in me, since in me they also are I. "That they also may be sanctified in the truth." For what else mean the words "they also" but ["they"] in the same way as I; "in the truth," and that "truth" am I?
John 17:20 · 7 passages

Neither pray I for these alone, but for them also which shall believe on me through their word;

In this prayer, therefore, Jesus may seem to have omitted praying for some of His own, unless we carefully examine His words in the prayer itself. For if He prayed first for those, as we have already shown, who were then with Him, and afterwards for those also who should believe on Him through their word, it may be said that He prayed not for those who were neither with Him when He so spake, nor afterwards believed through their word, but had done so at some previous time either of themselves, or in some other supposable manner. For was Nathanael with Him at that time? Was Joseph of Arimathea, who begged His body from Pilate, and of whom this same evangelist John testifies that he was already His disciple? Were His mother, Mary, and other women who, we know from the Gospel, had been prior to that time His disciples? Were those with Him then, of whom this evangelist John frequently says, "Many believed on Him"? For whence came the multitude of those who, with branches of trees, partly preceded and partly followed Him as He sat on the ass, saying, "Blessed is He that cometh in the name…
In this prayer, therefore, Jesus may seem to have omitted praying for some of His own, unless we carefully examine His words in the prayer itself. For if He prayed first for those, as we have already shown, who were then with Him, and afterwards for those also who should believe on Him through their word, it may be said that He prayed not for those who were neither with Him when He so spake, nor afterwards believed through their word, but had done so at some previous time either of themselves, or in some other supposable manner. For was Nathanael with Him at that time? Was Joseph of Arimathea, who begged His body from Pilate, and of whom this same evangelist John testifies that he was already His disciple? Were His mother, Mary, and other women who, we know from the Gospel, had been prior to that time His disciples? Were those with Him then, of whom this evangelist John frequently says, "Many believed on Him"? For whence came the multitude of those who, with branches of trees, partly preceded and partly followed Him as He sat on the ass, saying, "Blessed is He that cometh in the name of the Lord;" and along with them the children of whom He Himself declared that the prophecy had been uttered, "Out of the mouth of babes and of sucklings Thou hast perfected praise"? Whence the five hundred brethren, to all of whom at once He would not have appeared after His resurrection had they not previously believed on Him? Whence that hundred and nine who, with the eleven, were a hundred and twenty, when, being assembled together after His ascension, they waited and received the promise of the Holy Spirit? Whence came all these, save from those of whom it was said, "Many believed on Him"? For them, therefore, the Saviour did not at this time pray, seeing it was for those He prayed who were then with Him, and for others not who had already, but who were yet to believe on Him through their word.
(Tr. cix) When our Lord had prayed for His disciples, whom He named also Apostles, He added a prayer for all others who should believe on Him; Neither pray I for these alone, but for all others who shall believe on Me through their word. (Tr. cix) All, i. e. not only those who were then alive, but those who were to be born; not those only who heard the Apostles themselves, but us who were born long after their death. We have all believed in Christ through their word: for they first heard that word from Christ, and then preached it to others, and so it has come down, and will go down to all posterity. We may see that in this prayer there are some disciples whom He does not pray for; for those, i. e. who were neither with Him at the time, nor were about to believe on Him afterwards through the Apostles' word, but believed already. Was Nathanael with Him then, or Joseph of Arimathea, and many others, who, John says, believed on Him? I do not mention old Simeon, or Anna the prophetess, Zacharias, Elisabeth, or John the Baptist; for it might be answered that it was not necessary to pray…
(Tr. cix) When our Lord had prayed for His disciples, whom He named also Apostles, He added a prayer for all others who should believe on Him; Neither pray I for these alone, but for all others who shall believe on Me through their word.

(Tr. cix) All, i. e. not only those who were then alive, but those who were to be born; not those only who heard the Apostles themselves, but us who were born long after their death. We have all believed in Christ through their word: for they first heard that word from Christ, and then preached it to others, and so it has come down, and will go down to all posterity. We may see that in this prayer there are some disciples whom He does not pray for; for those, i. e. who were neither with Him at the time, nor were about to believe on Him afterwards through the Apostles' word, but believed already. Was Nathanael with Him then, or Joseph of Arimathea, and many others, who, John says, believed on Him? I do not mention old Simeon, or Anna the prophetess, Zacharias, Elisabeth, or John the Baptist; for it might be answered that it was not necessary to pray for dead persons, such as these who departed with such rich merits. With respect to the former then we must understand that they did not yet believe in Him, as He wished, but that after His resurrection, when the Apostles were taught and strengthened by the Holy Spirit, they attained to a right faith. The case of Paul however still remains, An Apostle not of men, or by men; (Gal. 1:1) and that of the robber, who believed when even the teachers themselves of the faith fell away. We must understand then, their word, to mean the word of faith itself which they preached to the world; it being called their word, because it was preached in the first instance and principally by them; for it was being preached by them, when Paul received it by revelation from Jesus Christ Himself. And in this sense the robber too believed their word. Wherefore in this prayer the Redeemer prays for all whom He redeemed, both present and to come. And then follows the thing itself which He prays for, That they all may be one. He asks that for all, which he asked above for the disciples; that all both we and they may be one.

(Tr. cx) We must particularly observe here, that our Lord did not say, that we may be all one, but that they may be all one, as Thou, Father, in Me, and I in Thee, are one, understood. For the Father is so in the Son, that They are one, because They are of one substance; but we can be one in Them, but not with Them; because we and They are not of one substance. They are in us, and we in Them, so as that They are one in Their nature, we one in ours. They are in us, as God is in the temple; we in Them, as the creature is in its Creator. Wherefore He adds, in Us, to show, that our being made one by charity, is to be attributed to the grace of God, not to ourselves.

(iv. de. Trin. c. ix) Or that in ourselves we cannot be one, severed from each other by diverse pleasures, and lusts, and the pollution of sin, from which we must be cleansed by a Mediator, in order to be one in Him.

(Tr. cx) But why does He say, That the world may believe that Thou hast sent Me? Will the world believe when we shall all be one in the Father and the Son? Is not this unity that peace eternal, which is the reward of faith, rather than faith itself? For though in this life all of us who hold in the same common faith are one, yet even this unity is not a means to belief, but the consequence of it. What means then, That all may be one, that the world may believe? He prays for the world when He says, Neither pray I for these alone, but for all those who shall believe on Me through their word. Whereby it appears that He does not make this unity the cause of the world believing, but prays that the world may believe, as He prays that they all may be one. The meaning will be clearer if we always put in the word ask; I ask that they all may be one; I ask that they may be one in Us; I ask that the world may believe that Thou hast sent Me.

(Tr. cx) Then our Saviour, Who, by praying to the Father, showed Himself to be man, now shows that, being God with the Father, He doth what He prays for: And the glory which Thou gavest Me, I have given them. What glory, but immortality, which human nature was about to receive in Him? For that which was to be by unchangeable predestination, though future, He expresses by the past tense. That glory of immortality, which He says was given Him by the Father, we must understand He gave Himself also. For when the Son is silent of His own cooperation in the Father's work, He shows His humility: when He is silent of the Father's cooperation in His work, He shows His equality. In this way here He neither disconnects Himself with the Father's work, when He says, The glory which Thou gavest Me, nor the Father with His work, when He says, I have given them. But as He was pleased by prayer to the Father to obtain that all might be one, so now He is pleased to effect the same by His own gift; for He continues, That all may be one, even as We are one.

(Tr. cx. 4) Nor is this said, however, as if to mean that the Father was not in us, or we in the Father. He only means to say, that He is Mediator between God and man. And what He adds, That they may be made perfect in one, shows that the reconciliation made by this Mediator, was carried on even to the enjoyment of everlasting blessedness. So what follows, That the world may know that Thou hast sent Me, must not be taken to mean the same as the words just above, That the world may believe. For as long as we believe what we do not see, we are not yet made perfect, as we shall be when we have merited to see what we believe. So that when He speaks of their being made perfect, we are to understand such a knowledge as shall be by sight, not such as is by faith. These that believe are the world, not a permanent enemy, but changed from an enemy to a friend; as it follows: And hast loved them, as Thou hast loved Me. The Father loves us in the Son, because He elected us in Him. These words do not prove that we are equal to the Only Begotten Son; for this mode of expression, as one thing so another, does not always signify equality. It sometimes only means, because one thing, therefore another. And this is its meaning here: Thou hast loved them, as Thou hast loved Me, i. e. Thou hast loved them, because Thou hast loved Me. There is no reason for God loving His members, but that He loves him. But since He hateth nothing that He hath made, who can adequately express how much He loves the members of His Only Begotten Son, and still more the Only Begotten Himself.
But we have still in reserve for the further solution of this question the blessed apostle, and that robber who was a villain in wickedness, but a believer on the cross. For the Apostle Paul tells us that he was made an apostle not of men, nor by man, but by Jesus Christ: and speaking of his own gospel, he says, "For I neither received it of man, neither did I learn it, but by the revelation of Jesus Christ." How then was he among those of whom it is said, "They shall believe on me through their word"? On the other hand, the robber believed at the very time when in the case of the teachers themselves such faith as they previously possessed had utterly failed. Not even he, therefore, believed on Christ through their word, and yet his faith was such that he confessed that He whom he saw nailed to the cross would not only rise again, but would also reign, when he said, "Remember me when Thou comest into Thy kingdom."
The Lord Jesus, in the now close proximity of His passion, after praying for His disciples, whom He also named apostles, with whom He had partaken of that last supper from which His betrayer had taken his departure on being revealed by the sop of bread, and with whom, after the latter's departure, and before beginning His prayer in their behalf, He had already spoken at length, conjoined all others also who were yet to believe on Him, and said to the Father, "Neither pray I for these alone," that is, for the disciples who were with Him at the time, "but for them also," He adds, "who shall believe on me through their word." Whereby He wished all His own to be understood: not only such as were then in the flesh, but those also who were yet to come. For all that have since believed on Him have doubtless believed, and shall yet believe till He come, through the word of the apostles; for to themselves He had said, "And ye also shall bear witness, because ye have been with me from the beginning;" and by them was the gospel ministered even before it was written, and every one assuredly who…
The Lord Jesus, in the now close proximity of His passion, after praying for His disciples, whom He also named apostles, with whom He had partaken of that last supper from which His betrayer had taken his departure on being revealed by the sop of bread, and with whom, after the latter's departure, and before beginning His prayer in their behalf, He had already spoken at length, conjoined all others also who were yet to believe on Him, and said to the Father, "Neither pray I for these alone," that is, for the disciples who were with Him at the time, "but for them also," He adds, "who shall believe on me through their word." Whereby He wished all His own to be understood: not only such as were then in the flesh, but those also who were yet to come. For all that have since believed on Him have doubtless believed, and shall yet believe till He come, through the word of the apostles; for to themselves He had said, "And ye also shall bear witness, because ye have been with me from the beginning;" and by them was the gospel ministered even before it was written, and every one assuredly who believeth on Christ believeth the gospel. Accordingly, those who He says should believe on Him through their word, are not to be understood as referring only to such as heard the apostles themselves while they lived in the flesh; but others also after their decease, and we, too, born long afterwards, have believed on Christ through their word. For they that were then with Him preached to the others what they had heard from Him; and so their word, that we too might believe, has found its way to us, and wherever His Church exists, and shall yet reach down to posterity, whoever and wherever they be who shall hereafter believe on Him.
Accordingly it remains that if we are to believe that the Lord Jesus, in this prayer, prayed for all of His own who either then were or should thereafter be in this life, which is a state of trial upon earth, we must so understand the expression, "through their word," as to believe that it here signified the word of faith itself which they preached in the world, and that it was called their word because it was primarily and principally preached by them. For it was already in the course of being preached by them in the earth when Paul received that same word of theirs by the revelation of Jesus Christ. Whence also it came about that he compared the Gospel with them, lest by any means he had run, or should run, in vain; and they gave him their right hand because in him also they found, although not given him by them, their own word which they were already preaching, and in which they were now established. And in regard to this word of the resurrection of Christ, it is said by the same apostle, "Whether it were I, or they, so we preach, and so ye believed;" and again, "This is the word…
Accordingly it remains that if we are to believe that the Lord Jesus, in this prayer, prayed for all of His own who either then were or should thereafter be in this life, which is a state of trial upon earth, we must so understand the expression, "through their word," as to believe that it here signified the word of faith itself which they preached in the world, and that it was called their word because it was primarily and principally preached by them. For it was already in the course of being preached by them in the earth when Paul received that same word of theirs by the revelation of Jesus Christ. Whence also it came about that he compared the Gospel with them, lest by any means he had run, or should run, in vain; and they gave him their right hand because in him also they found, although not given him by them, their own word which they were already preaching, and in which they were now established. And in regard to this word of the resurrection of Christ, it is said by the same apostle, "Whether it were I, or they, so we preach, and so ye believed;" and again, "This is the word of faith," he says, "which we preach, that if thou shalt confess with thy mouth that Jesus is the Lord, and shalt believe in thine heart that God hath raised Him from the dead, thou shalt be saved." And in the Acts of the Apostles we read that in Christ, God hath marked out [the ground of] faith unto all men, in that He hath raised Him from the dead. Accordingly, this word of faith, because principally and primarily preached by the apostles who adhered to Him, was called their word. Not, however, on that account does it cease to be the word of God because it is called their word; for the same apostle says that the Thessalonians received it from him "not as the word of men, but, as it is in truth, the word of God." "Of God," for the very reason that it was freely given by God; but called "their word," because primarily and principally committed to them by God to be preached. In the same way also the thief mentioned above had in the matter of his own faith their word, which was called theirs precisely because the preaching of it primarily and principally pertained to the office they filled.
We are therefore to understand that their faith in Him was not yet such as He wished it to be, inasmuch as even Peter himself, to whom, on making the confession, "Thou art the Christ, the Son of the living God," He had borne so excellent a testimony, was disposed rather to hinder Him from dying than to believe in His resurrection when dead, and hence was called immediately thereafter by the same of Satan. Those, accordingly, are found to be the greater in faith who were long since deceased, and yet, through the revelation of the Spirit, had no manner of doubt that Christ would rise again, than those who, after attaining to the belief that He should redeem Israel, at the sight of His death lost all the hope they previously possessed regarding Him. The best thing for us, therefore, to believe is, that after His resurrection, when the Holy Spirit was bestowed, and the apostles taught and confirmed, and from its outset constituted teachers in the Church, others, through their word, attained the proper faith in Christ, or, in other words, that they then got firm hold of the faith of His r…
We are therefore to understand that their faith in Him was not yet such as He wished it to be, inasmuch as even Peter himself, to whom, on making the confession, "Thou art the Christ, the Son of the living God," He had borne so excellent a testimony, was disposed rather to hinder Him from dying than to believe in His resurrection when dead, and hence was called immediately thereafter by the same of Satan. Those, accordingly, are found to be the greater in faith who were long since deceased, and yet, through the revelation of the Spirit, had no manner of doubt that Christ would rise again, than those who, after attaining to the belief that He should redeem Israel, at the sight of His death lost all the hope they previously possessed regarding Him. The best thing for us, therefore, to believe is, that after His resurrection, when the Holy Spirit was bestowed, and the apostles taught and confirmed, and from its outset constituted teachers in the Church, others, through their word, attained the proper faith in Christ, or, in other words, that they then got firm hold of the faith of His resurrection. And in this way also, that all those who seemed to have already believed on Him really belonged to the number of those for whom He prayed, when He said, "Neither pray I for these alone, but for them also who shall believe on me through their word."
And once more, when murmuring arose among the Grecian widows in reference to the serving of the tables, previous to the time when Paul was brought to the faith of Christ, the reply given by the apostles, who before then had adhered to the Lord, was: "It is not good that we should leave the word of God, and serve tables." Then it was that they provided for the ordination of deacons, that they themselves might not be drawn aside from the duty of preaching the word. Hence that was properly enough called their word which is the word of faith, whereby all, from whatever quarter they had heard it, believed on Christ, or, as yet to hear it, should thereafter believe. In this prayer, therefore, all whom He redeemed, whether then alive or thereafter to live in the flesh, were prayed for by our Redeemer when, praying for the apostles who were then with Him, He also conjoined those who were yet to believe on Him through their word.
John 17:21 · 3 passages

That they all may be one; as thou, Father, art in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me.

How, then, are we to understand Him when He says, "That they also may be one in us, that the world may believe that Thou hast sent me," but just in this way, that He did not assign the cause of the world believing to the fact that those others are one, as if it believed on the ground that it saw them to be one; for the world itself here consisteth of all who by their own believing become one; but in His prayer He said, "That the world may believe," just as in His prayer He also said, "That they all may be one;" and still further in the same prayer, "That they also may be one in us." For the words, "they all may be one," are equivalent to "the world may believe," since it is by believing that they become one, perfectly one; that is, those who, although one by nature, had ceased to be so by their mutual dissensions. In fine, if the verb which He uses, "I pray," be understood in the third clause, or rather, to make the whole fuller, be everywhere supplied, the explanation of this sentence will be all the clearer: I pray "that they all may be one; as Thou, Father, in me, and I in Thee;"…
How, then, are we to understand Him when He says, "That they also may be one in us, that the world may believe that Thou hast sent me," but just in this way, that He did not assign the cause of the world believing to the fact that those others are one, as if it believed on the ground that it saw them to be one; for the world itself here consisteth of all who by their own believing become one; but in His prayer He said, "That the world may believe," just as in His prayer He also said, "That they all may be one;" and still further in the same prayer, "That they also may be one in us." For the words, "they all may be one," are equivalent to "the world may believe," since it is by believing that they become one, perfectly one; that is, those who, although one by nature, had ceased to be so by their mutual dissensions. In fine, if the verb which He uses, "I pray," be understood in the third clause, or rather, to make the whole fuller, be everywhere supplied, the explanation of this sentence will be all the clearer: I pray "that they all may be one; as Thou, Father, in me, and I in Thee;" I pray "that they also may be one in us;" I pray "that the world may believe that Thou hast sent me." And, mark, He added the words "in us" in order that we may know that our being made one in that love of unchanging faithfulness is to be attributed to the grace of God, and not to ourselves: just as the apostle, after saying, "For ye were at one time darkness, but now are ye light," that none might attribute the doing of this to themselves, added, "in the Lord."
But then after saying, "That they also may be one in us," He added, "That the world may believe that Thou hast sent me." What does He mean by this? Is it that the world will then be brought to the faith, when we shall all be one in the Father and Son? Is not such a state the everlasting peace, and the reward of faith, rather than faith itself? For we shall be one not in order to our believing, but because we have believed. But although in this life, because of the common faith itself, all who believe in one are one according to the words of the apostle, "For ye are all one in Christ Jesus;" even thus we are one, not in order to our believing, but because we do believe. What, then, is meant by the words, "That they all may be one, that the world may believe"? This, doubtless, that the "all" are themselves the believing world. For those who shall be one are not of one class, and the world that is thereafter to believe on this very ground that these shall be one, of another; since it is perfectly certain that He says, "That they all may be one," of those of whom He had said before, "Nei…
But then after saying, "That they also may be one in us," He added, "That the world may believe that Thou hast sent me." What does He mean by this? Is it that the world will then be brought to the faith, when we shall all be one in the Father and Son? Is not such a state the everlasting peace, and the reward of faith, rather than faith itself? For we shall be one not in order to our believing, but because we have believed. But although in this life, because of the common faith itself, all who believe in one are one according to the words of the apostle, "For ye are all one in Christ Jesus;" even thus we are one, not in order to our believing, but because we do believe. What, then, is meant by the words, "That they all may be one, that the world may believe"? This, doubtless, that the "all" are themselves the believing world. For those who shall be one are not of one class, and the world that is thereafter to believe on this very ground that these shall be one, of another; since it is perfectly certain that He says, "That they all may be one," of those of whom He had said before, "Neither pray I for these alone, but for those also who shall believe on me through their word," immediately adding as He does, "That they all may be one." And this "all," what is it but the world; not certainly that which is hostile, but that which is believing? For you see here that He who had said, "I pray not for the world," now prayeth for the world that it may believe. For there is a world whereof it is written, "That we might not be condemned with this world." For that world He prayeth not, for He is fully aware to what it is predestinated. And there is a world whereof it is written, "For the Son of man came not to condemn the world, but that the world through Him might be saved;" and hence the apostle also says, "God was in Christ, reconciling the world unto Himself." For this world it is that He prayeth, in saying, "That the world may believe that Thou hast sent me." For through this faith the world is reconciled unto God when it believes in the Christ whom God has sent.
After the Lord Jesus had prayed for His disciples whom He had with Him at the time, and had conjoined with them others who were also His own, by saying, "Neither pray I for these alone, but for them also who shall believe on me through their word," as if we were inquiring what or wherefore He prayed for them, He straightway subjoined, "That they all may be one; as Thou, Father, [art] in me, and I in Thee, that they also may be one in us." And a little above, while still praying for the disciples alone who were then with Him, He said, "Holy Father, keep in Thine own name those whom Thou hast given me, that they may be one, as we are." It is the same thing, therefore, that He now also prayed for in our behalf, as He did at that time in theirs, namely, that all-to wit, both we and they-may be one. And here we must take particular notice that the Lord did not say that we all may be one, but, "that they all may be one; as Thou Father, in me, and I in Thee"; because He had also said before of the disciples who were with Him, "That they may be one, as we are." The Father, therefore, is in t…
After the Lord Jesus had prayed for His disciples whom He had with Him at the time, and had conjoined with them others who were also His own, by saying, "Neither pray I for these alone, but for them also who shall believe on me through their word," as if we were inquiring what or wherefore He prayed for them, He straightway subjoined, "That they all may be one; as Thou, Father, [art] in me, and I in Thee, that they also may be one in us." And a little above, while still praying for the disciples alone who were then with Him, He said, "Holy Father, keep in Thine own name those whom Thou hast given me, that they may be one, as we are." It is the same thing, therefore, that He now also prayed for in our behalf, as He did at that time in theirs, namely, that all-to wit, both we and they-may be one. And here we must take particular notice that the Lord did not say that we all may be one, but, "that they all may be one; as Thou Father, in me, and I in Thee"; because He had also said before of the disciples who were with Him, "That they may be one, as we are." The Father, therefore, is in the Son, and the Son in the Father, in such a way as to be one, because they are of one substance; but while we may indeed be in them, we cannot be one with them; for they and we are not of one substance, in as far as the Son is God along with the Father. But in as far as He is man, He is of the same substance as we are. But at present He wished rather to call attention to that other statement which He made use of in another place, "I and the Father are one," where He intimated that His own nature was the same with that of the Father. And accordingly, though the Father and Son, or even the Holy Spirit, are in us, we must not suppose that they are of one nature with ourselves. And hence they are in us, or we are in them, in this sense, that they are one in their own nature, and we are one in ours. For they are in us, as God in His temple; but we are in them, as the creature in its Creator.
John 17:22

And the glory which thou gavest me I have given them; that they may be one, even as we are one:

Furthermore, our Saviour in thus praying to the Father showed Himself to be man; while He now also shows that He Himself, as being God along with the Father, doeth that which He prayeth for, when He says, "And the glory which Thou gavest me, I have given them." And what was that glory but immortality, which human nature was henceforth to receive in Him? For not even He Himself had as yet received it, but in His own customary way, on account of the absolute fixedness of predestination, He intimates what is future in verbs of the past tense, because being now on the point of being glorified, or in other words, raised up again by the Father, He Himself is going to raise us up to the same glory in the end. What we have here is similar to what He says elsewhere, "As the Father raiseth up the dead, and quickeneth them, even so the Son quickeneth whom He will." And "whom," but just the same as the Father? "For what things soever the Father doeth," not other things, but "these also doeth the Son," not in a different way, but "in like manner." And in this way He also raised up even His own se…
Furthermore, our Saviour in thus praying to the Father showed Himself to be man; while He now also shows that He Himself, as being God along with the Father, doeth that which He prayeth for, when He says, "And the glory which Thou gavest me, I have given them." And what was that glory but immortality, which human nature was henceforth to receive in Him? For not even He Himself had as yet received it, but in His own customary way, on account of the absolute fixedness of predestination, He intimates what is future in verbs of the past tense, because being now on the point of being glorified, or in other words, raised up again by the Father, He Himself is going to raise us up to the same glory in the end. What we have here is similar to what He says elsewhere, "As the Father raiseth up the dead, and quickeneth them, even so the Son quickeneth whom He will." And "whom," but just the same as the Father? "For what things soever the Father doeth," not other things, but "these also doeth the Son," not in a different way, but "in like manner." And in this way He also raised up even His own self. For to this effect he said, "Destroy this temple, and in three days I will raise it up again." Accordingly the glory of immortality, which He says had been given Him by the Father, He must be also understood as having bestowed upon Himself, although He does not say it. For on this very account He more frequently says that the Father alone doeth, what He Himself also doeth along with the Father, that everything whatever He may attribute to Him of whom He is.
John 17:23 · 4 passages

I in them, and thou in me, that they may be made perfect in one; and that the world may know that thou hast sent me, and hast loved them, as thou hast loved me.

The love, therefore, wherewith God loveth, is incomprehensible and immutable. For it was not from the time that we were reconciled unto Him by the blood of His Son that He began to love us; but He did so before the foundation of the world, that we also might be His sons along with His Only-begotten, before as yet we had any existence of our own. Let not the fact, then, of our having been reconciled unto God through the death of His Son be so listened to or so understood, as if the Son reconciled us to Him in this respect, that He now began to love those whom He formerly hated, in the same way as enemy is reconciled to enemy, so that thereafter they become friends, and mutual love takes the place of their mutual hatred; but we were reconciled unto Him who already loved us, but with whom we were at enmity because of our sin. Whether I say the truth on this, let the apostle testify, when he says: "God commendeth His love toward us, in that, while we were yet sinners, Christ died for us." He, therefore, had love toward us even when we were practising enmity against Him and working iniqui…
The love, therefore, wherewith God loveth, is incomprehensible and immutable. For it was not from the time that we were reconciled unto Him by the blood of His Son that He began to love us; but He did so before the foundation of the world, that we also might be His sons along with His Only-begotten, before as yet we had any existence of our own. Let not the fact, then, of our having been reconciled unto God through the death of His Son be so listened to or so understood, as if the Son reconciled us to Him in this respect, that He now began to love those whom He formerly hated, in the same way as enemy is reconciled to enemy, so that thereafter they become friends, and mutual love takes the place of their mutual hatred; but we were reconciled unto Him who already loved us, but with whom we were at enmity because of our sin. Whether I say the truth on this, let the apostle testify, when he says: "God commendeth His love toward us, in that, while we were yet sinners, Christ died for us." He, therefore, had love toward us even when we were practising enmity against Him and working iniquity; and yet to Him it is said with perfect truth, "Thou hatest, O Lord, all workers of iniquity." Accordingly, in a wonderful and divine manner, even when He hated us, He loved us; for He hated us, in so far as we were not what He Himself had made; and because our own iniquity had not in every part consumed His work, He knew at once both how, in each of us, to hate what we had done, and to love what He had done.
He did not say, “I and they are one,” although inasmuch as he is the head of the church and the church is his body, he could not only say, “I and they are one but also one person,” because the head and the body are the one Christ. But when he reveals that his own Godhead is consubstantial with the Father (for which reason he also says in another place, “I and the Father are one”30), then it is rather his will that his own in their own kind, that is to say, in the consubstantial equality of the same nature, should be one, but be one in him. For they could not be one in themselves, since they were separated from one another by conflicting inclinations, desires and unclean sins. They are, therefore, purified through the Mediator, in order that they may be one in him. And indeed [they are one] not only through the same nature in which all mortals become equal to the angels, but also [they are one] by the same will working together most harmoniously toward the same blessedness, and [they are] fused together in some way by the fire of charity into one spirit.

ON THE TRINITY 4.9.12

And had He said, That they may know that Thou hast sent me, it would be just of the same force as what He actually does say, "that the world may know." For they are the world that abideth not in enmity, as doth the world that is foreordained to damnation; but one that out of an enemy has been transformed into a friend, and on whose account "God was in Christ reconciling the world unto Himself." Therefore said He, "I in them, and Thou in me;" as if He had said, I in those to whom Thou hast sent me; and Thou in me, reconciling the world unto Thyself through me. In close relation to these come also His further words: "And Thou hast loved them as Thou hast loved me." That is to say, in the Son the Father loveth us, because in Him He hath chosen us before the foundation of the world. For He who loveth the Only-begotten, certainly loveth also His members which, through His instrumentality, He engrafted into Him by adoption. But we are not on this account equal to the only-begotten Son, by whom we have been created and re-created, that it is said, "Thou hast loved them as [Thou hast] also…
And had He said, That they may know that Thou hast sent me, it would be just of the same force as what He actually does say, "that the world may know." For they are the world that abideth not in enmity, as doth the world that is foreordained to damnation; but one that out of an enemy has been transformed into a friend, and on whose account "God was in Christ reconciling the world unto Himself." Therefore said He, "I in them, and Thou in me;" as if He had said, I in those to whom Thou hast sent me; and Thou in me, reconciling the world unto Thyself through me.

In close relation to these come also His further words: "And Thou hast loved them as Thou hast loved me." That is to say, in the Son the Father loveth us, because in Him He hath chosen us before the foundation of the world. For He who loveth the Only-begotten, certainly loveth also His members which, through His instrumentality, He engrafted into Him by adoption. But we are not on this account equal to the only-begotten Son, by whom we have been created and re-created, that it is said, "Thou hast loved them as [Thou hast] also [loved] me." For one does not always intimate equality when he says, As this, so also that other; but sometimes only, Because this is, so also is the other; or, That the one is, in order that the other may be also. For who could say that the apostles were sent by Christ into the world in exactly the same way as He Himself was sent by the Father? For, to say nothing of other differences, which it would be tedious to mention, they at all events were sent when they were already men; but He was sent in order that He might be man; and yet He said above, "As Thou hast sent me into the world, even so have I sent them into the world;" as if He had said, Because Thou hast sent me, I have sent them. So also in the passage before us He says, "Thou hast loved them, as Thou hast loved me;" which is nothing else than this, Thou hast loved them because that Thou hast also loved me. For He could not but love the members of the Son, seeing that He loveth the Son Himself; nor is there any other reason for loving His members, save that He loveth Himself. But He loveth the Son as regards His Godhead, because He begat Him equal with Himself; He loveth Him also in regard to what He is as man, because the Only-begotten Word was Himself made flesh, and on account of the Word is the flesh of the Word dear to Him; but He loveth us, inasmuch as we are the members of Him whom He loveth; and in order that we might be so, He loved us on this account before we existed.
And then He added: "I in them, and Thou in me, that they may be made perfect in one." Here He briefly intimated Himself as the Mediator between God and men. Nor was this said in any such way as if the Father were not in us, or we were not in the Father; since He had also said in another place, "We will come unto him, and make our abode with him;" and a little before in this present passage He had not said, "I in them and Thou in me," as He said now; or, They in me, and I in Thee; but, "Thou in me, and I in Thee, and they in us." Accordingly, when He now says, "I in them, and Thou in me," the words take this form in reference to the person of the Mediator, like that other expression used by the apostle, "Ye are Christ's, and Christ is God's." But in adding, "That they may be made perfect in one," He showed that the reconciliation, which is effected by the Mediator, is carried to the very length of bringing us to the enjoyment of that perfect blessedness, which is thenceforth incapable of further addition. Hence the words that follow, "That the world may know that Thou hast sent me," a…
And then He added: "I in them, and Thou in me, that they may be made perfect in one." Here He briefly intimated Himself as the Mediator between God and men. Nor was this said in any such way as if the Father were not in us, or we were not in the Father; since He had also said in another place, "We will come unto him, and make our abode with him;" and a little before in this present passage He had not said, "I in them and Thou in me," as He said now; or, They in me, and I in Thee; but, "Thou in me, and I in Thee, and they in us." Accordingly, when He now says, "I in them, and Thou in me," the words take this form in reference to the person of the Mediator, like that other expression used by the apostle, "Ye are Christ's, and Christ is God's." But in adding, "That they may be made perfect in one," He showed that the reconciliation, which is effected by the Mediator, is carried to the very length of bringing us to the enjoyment of that perfect blessedness, which is thenceforth incapable of further addition. Hence the words that follow, "That the world may know that Thou hast sent me," are not, I think, to be taken as if He had again said, "That the world may believe;" for sometimes, to know, is also used in the same sense as to believe, as it is in the words He uttered some time before: "And they have known truly that I came out from Thee, and they have believed that Thou didst send me." He expressed the same thing by the later words, "they have believed," as He had done by the earlier, "they have known." But inasmuch as He here speaks of the consummation, the knowledge must be taken for such, as it shall then be by sight, and not, as it now is, by faith. For an order seems to have been preserved in reference to what He said a little before, "that the world may believe;" while here it is, "that the world may know." For although He said there, "that they all may be one," and "may be one in us," yet He did not say, "they may be made perfect in one," and so subjoined the words, "that the world may believe that Thou hast sent me;" but here He said, "That they may be made perfect in one," and then added, not, "that the world may believe," but, "that the world may know that Thou hast sent me." For so long as we believe what we do not see, we are not yet made perfect, as we shall be when we have merited the sight of that which we believe. Most correctly, therefore, did He say in that previous place, "That the world may believe," and here "That the world may know;" yet both there and here, "that Thou hast sent me;" that we may know, so far as belongs to the inseparable love of the Father and the Son, that at present we only believe what we are on the way, by believing, to know.
John 17:24 · 4 passages

Father, I will that they also, whom thou hast given me, be with me where I am; that they may behold my glory, which thou hast given me: for thou lovedst me before the foundation of the world.

The Lord Jesus raises up His people to a great hope, than which there could not possibly be a greater. Listen and rejoice in hope, that, since the present is not a life to be loved, but to be tolerated, you may have the power of patient endurance amid all its tribulation. Listen, I say, and weigh well to what it is that our hopes are exalted. Christ Jesus saith, The Son of God, the Only-begotten, who is co-eternal and equal with the Father, saith: He, who for our sakes became man, but became not, like every man besides, a liar, saith: the Way, the Life, the Truth saith: He who overcame the world, saith of those for whom He overcame it: listen, believe, hope, desire what He saith: "Father," He says, "I will that they also whom Thou hast given me be with me where I am." Who are these who He says were given Him by the Father? Are they not those of whom He says in another place, "No man cometh unto me, unless the Father, who hath sent me, draw him"? We already know if we have made any beneficial progress in this Gospel, how it is that the things which He says the Father doeth, He Himself…
The Lord Jesus raises up His people to a great hope, than which there could not possibly be a greater. Listen and rejoice in hope, that, since the present is not a life to be loved, but to be tolerated, you may have the power of patient endurance amid all its tribulation. Listen, I say, and weigh well to what it is that our hopes are exalted. Christ Jesus saith, The Son of God, the Only-begotten, who is co-eternal and equal with the Father, saith: He, who for our sakes became man, but became not, like every man besides, a liar, saith: the Way, the Life, the Truth saith: He who overcame the world, saith of those for whom He overcame it: listen, believe, hope, desire what He saith: "Father," He says, "I will that they also whom Thou hast given me be with me where I am." Who are these who He says were given Him by the Father? Are they not those of whom He says in another place, "No man cometh unto me, unless the Father, who hath sent me, draw him"? We already know if we have made any beneficial progress in this Gospel, how it is that the things which He says the Father doeth, He Himself doeth likewise along with the Father. They are those, therefore, whom He has received from the Father, whom He Himself has also chosen out of the world, and chosen that they may be no more of the world, even as He also is not of the world; and yet that they also may be a world that believeth and knoweth that Christ has been sent by God the Father that the world might be delivered from the world, and so, as a world that was to be reconciled unto God, might not be condemned with the world that lieth in enmity.
But if it is in respect of the form of God, wherein He is equal to the Father, that we would be inclined to understand His words, "I will that they also be with me, where I am," let our mind get quit of every thought of material images: whatever the soul has had presented to it, that is endowed with length, or breadth, or thickness, tinted by the light with any sort of bodily hue, or diffused through local space of any kind, whether finite or infinite, let it, as far as possible, turn away from all such notions the glance of its contemplation on the inward bent of its thoughts. And let us not be making inquiries as to where the Son, the Father's co-equal, is, since no one has yet found out where He is not. But if any one would inquire, let him inquire rather how he may be with Him; not everywhere as He is, but wherever He may be. For when He said to the man that was expiating his crimes on the tree, and making confession unto salvation, "Today shall thou be with me in paradise," in respect to His human nature His own soul was on that very day to be in hell, His flesh in the sepulchre…
But if it is in respect of the form of God, wherein He is equal to the Father, that we would be inclined to understand His words, "I will that they also be with me, where I am," let our mind get quit of every thought of material images: whatever the soul has had presented to it, that is endowed with length, or breadth, or thickness, tinted by the light with any sort of bodily hue, or diffused through local space of any kind, whether finite or infinite, let it, as far as possible, turn away from all such notions the glance of its contemplation on the inward bent of its thoughts. And let us not be making inquiries as to where the Son, the Father's co-equal, is, since no one has yet found out where He is not. But if any one would inquire, let him inquire rather how he may be with Him; not everywhere as He is, but wherever He may be. For when He said to the man that was expiating his crimes on the tree, and making confession unto salvation, "Today shall thou be with me in paradise," in respect to His human nature His own soul was on that very day to be in hell, His flesh in the sepulchre; but as respected His Godhead He was certainly also in paradise. And therefore the soul of the thief, absolved from his by-gone crimes, and already in the blessed enjoyment of His grace, although it could not be everywhere as He was, yet could on that very day be also with Him in paradise, from which He, who is always everywhere, had not withdrawn.
Because of the same blessed hope the apostle also says: "But God, who is rich in mercy, for His great love wherewith He loved us, even when we were dead in sins, hath quickened us together with Christ; by whose grace we are saved; and hath raised us up together, and made us sit together in heavenly places in Christ Jesus." And so accordingly we may understand the Lord to have said, "That where I am, there they may be also." He, indeed, said of Himself that He was there already; but of us He merely declared that He wished us to be there with Him, without any indication that we were there already. But what the Lord said that He wished to be done, the apostle spake of as already accomplished. For he said not, He will yet raise us up, and make us sit in heavenly places; but, "hath raised us up, and made us sit in heavenly places:" for it is not without good grounds, but in believing assurance, that he reckons as already done what he is certain will yet be done.
Let no one disturb the clearness of the meaning by any cloudy contradiction; but let what follows furnish its testimony to the words that precede. For after saying, "I will that they also be with me where I am," He went on immediately to add, "That they may behold my glory, which Thou gavest me: for Thou lovedst me before the foundation of the world." "That they may behold," He said; not, that they may believe. This is faith's wages, not faith itself. For if faith has been correctly defined in the Epistle to the Hebrews as "the assurance [conviction] of things that are not seen," why may not the wages of faith be defined, the beholding of things which were hoped for in faith? For when we shall see the glory which the Father hath given the Son, even though we may understand what is spoken of in this passage, not as that [glory] which the Father gave His co-equal Son in begetting Him, but as that which He gave Him, when become the Son of man, after the death of the cross;-when, I say, we shall see that glory of the Son, then of a certainty shall take place the judgment of the quick and…
Let no one disturb the clearness of the meaning by any cloudy contradiction; but let what follows furnish its testimony to the words that precede. For after saying, "I will that they also be with me where I am," He went on immediately to add, "That they may behold my glory, which Thou gavest me: for Thou lovedst me before the foundation of the world." "That they may behold," He said; not, that they may believe. This is faith's wages, not faith itself. For if faith has been correctly defined in the Epistle to the Hebrews as "the assurance [conviction] of things that are not seen," why may not the wages of faith be defined, the beholding of things which were hoped for in faith? For when we shall see the glory which the Father hath given the Son, even though we may understand what is spoken of in this passage, not as that [glory] which the Father gave His co-equal Son in begetting Him, but as that which He gave Him, when become the Son of man, after the death of the cross;-when, I say, we shall see that glory of the Son, then of a certainty shall take place the judgment of the quick and the dead, and then shall the wicked be taken away that he may not behold the glory of the Lord; and what [glory], save that of His Godhead? For blessed are the pure in heart, for they shall see God: and because the wicked are not pure in heart, therefore they shall not see. Then shall they go away into everlasting punishment; for so shall the wicked be taken away, that he may not behold the glory of the Lord: but the righteous shall go into life eternal. And what is life eternal? "That they may know Thee, the only true God, and Jesus Christ, whom Thou hast sent": not, indeed, as those knew Him, who although impure in heart, yet were able to see Him as He sat in judgment in His glorified servant-form; but as He is yet to be known by the pure in heart, as the only true God, the Son along with the Father and Holy Spirit, because the Trinity itself is the only true God.

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