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Translation
King James Version
Then came the disciples to Jesus apart, and said, Why could not we cast him out?
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KJV (with Strong's)
Then G5119 came G4334 the disciples G3101 to Jesus G2424 apart G2596 G2398, and said G2036, Why G1302 could G1410 not G3756 we G2249 cast G1544 him G846 out G1544?
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Complete Jewish Bible
Then the talmidim went to him privately and said, "Why couldn't we drive it out?" He said to them, "Because you have such little trust! Yes! I tell you that if you
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Berean Standard Bible
Afterward the disciples came to Jesus privately and asked, “Why couldn’t we drive it out?”
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American Standard Version
Then came the disciples to Jesus apart, and said, Why could not we cast it out?
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World English Bible Messianic
Then the disciples came to Yeshua privately, and said, “Why weren’t we able to cast it out?”
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Geneva Bible (1599)
Then came the disciples to Iesus apart, and said, Why could not we cast him out?
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Young's Literal Translation
Then the disciples having come to Jesus by himself, said, `Wherefore were we not able to cast him out?'
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In the KJVVerse 23,720 of 31,102

Study This Verse

SUMMARY

Matthew 17:19 records the disciples' perplexed and private inquiry to Jesus following their public failure to cast out a demon from a boy. Their question, "Why could not we cast him out?", reveals their confusion and perhaps embarrassment, especially given their prior success in similar acts of spiritual authority. This moment serves as a pivotal point for Jesus to impart deeper truths about the nature of faith, prayer, and the spiritual power required for certain battles, highlighting the disciples' ongoing need for growth and complete dependence on their Master.

CONTEXT

  • Literary Context: This verse is situated immediately after the dramatic event of the Transfiguration on the mountain, where Jesus' divine glory was revealed to Peter, James, and John (Matthew 17:1-8). Descending from the mountain, Jesus and the three disciples rejoin the others, only to find them embroiled in a difficult situation: a father has brought his demon-possessed son to them, and despite their efforts, the disciples have failed to heal him (Matthew 17:14-16). Jesus then intervenes, rebuking the demon and healing the boy instantly (Matthew 17:18). The disciples' question in Matthew 17:19 naturally arises from their public failure and Jesus' immediate success, setting the stage for Jesus' subsequent teaching on faith and prayer in Matthew 17:20-21.

  • Historical & Cultural Context: In first-century Jewish society, demon possession was a recognized phenomenon, often associated with various physical and mental ailments. Exorcism was practiced by various religious figures, including some Jewish exorcists, though with varying degrees of success. Jesus' ministry, however, was marked by an unprecedented authority over demons, distinguishing Him from all others. The disciples, having been previously commissioned by Jesus and given authority to cast out demons and heal diseases (Matthew 10:1), would have been accustomed to success in these endeavors. Their failure here would have been particularly perplexing and potentially humiliating, challenging their understanding of their delegated power and their role in Jesus' ministry. The act of coming to Jesus "apart" (κατ' ἰδίαν, kat' idian) signifies a desire for a private, confidential explanation, away from the crowds and the other disciples, underscoring their vulnerability and earnestness.

  • Key Themes: Matthew 17:19 contributes significantly to several overarching themes in Matthew's Gospel. It highlights the theme of discipleship, showcasing the ongoing spiritual formation of the disciples, who, despite their calling and previous empowerment, still have much to learn about the nature of spiritual authority and dependence on Christ. It underscores the limitations of human power even when divinely delegated, emphasizing that true spiritual power flows from God alone and is not merely a formulaic ability. The disciples' failure and subsequent question also introduce the crucial themes of faith and prayer, which Jesus immediately addresses in Matthew 17:20-21, revealing that certain spiritual strongholds require a deeper level of spiritual engagement and reliance on God. Ultimately, this passage reinforces the supremacy of Jesus' authority over all spiritual forces, contrasting His effortless victory with the disciples' struggle.

EXPOSITION AND ANALYSIS

Key Word Analysis

  • Why (Greek, diatí', G1302): From dia (through) and tis (what), meaning "through what cause?" or "wherefore." This interrogative adverb indicates the disciples' profound confusion and desire for an explanation. It's not a casual question but a direct challenge to their understanding of their own spiritual authority and the nature of the spiritual battle they just lost. Their use of "why" signifies a search for the underlying reason for their unexpected failure.
  • could (Greek, dýnamai', G1410): To be able or possible; to have power. This verb speaks directly to the disciples' perceived lack of ability or power in this specific instance. They had previously been able to cast out demons, so their inability here was a stark and unsettling contrast. The question "Why could not we?" highlights their bewilderment at the apparent absence of the power they believed they possessed.
  • cast out (Greek, ekbállō', G1544): From ek (out) and ballō (to throw); to eject, drive out, expel. This is the standard term used for exorcism in the Gospels. The disciples' failure to "cast out" the demon underscores the severity of the spiritual resistance they encountered and their inability to overcome it with their current level of spiritual understanding or preparation. It emphasizes the direct confrontation with an evil spiritual entity.

Verse Breakdown

  • "Then came the disciples to Jesus apart": This phrase marks a significant transition from the public scene of the healing to a private, intimate conversation. The term "apart" (κατ' ἰδίαν, kat' idian) emphasizes the disciples' desire for a confidential discussion, perhaps out of embarrassment or a genuine need for deeper instruction away from the crowds. Their initiative to approach Jesus underscores their recognition of His ultimate authority and wisdom as their Master and the source of their power.
  • "and said": This simple conjunction introduces the direct speech of the disciples, highlighting their immediate and pressing concern. It shows their willingness to confront their failure and seek understanding directly from Jesus, rather than speculating among themselves or becoming discouraged.
  • "Why could not we cast him out?": This direct, pointed question is the heart of the verse. It reveals the disciples' profound perplexity and perhaps a sense of frustration or even shame. They had been given authority to cast out demons (Matthew 10:1) and had successfully done so before. Their inability in this specific case challenges their understanding of their delegated power and prompts Jesus' subsequent teaching on faith and prayer.

Literary Devices

The verse employs several literary devices. The primary device is Dialogue, as it records a direct question from the disciples to Jesus, initiating a crucial teaching moment. The disciples' question itself functions as a Rhetorical Question, not necessarily expecting a simple "yes" or "no" answer, but rather an explanation for their failure, thereby setting up Jesus' subsequent profound teaching on faith and prayer. There is also an element of Irony in the situation: the disciples, who had previously succeeded in exorcisms, fail here, while Jesus, who has just been transfigured in glory, effortlessly casts out the demon. This highlights the stark contrast between human limitations and divine power. Furthermore, the scene serves as Foreshadowing for Jesus' teaching in the following verses, where He will explain the spiritual principles necessary for overcoming such formidable spiritual opposition.

THEOLOGICAL AND THEMATIC CONNECTIONS

Matthew 17:19 serves as a crucial theological pivot, moving from a demonstration of divine power to an explanation of the spiritual principles required to access and wield that power. The disciples' failure underscores the truth that spiritual authority is not an inherent ability or a mere formula, but a dynamic reliance on God's power, requiring a deep, active faith and a life of prayer. This incident exposes the reality that some spiritual battles are more intense than others, demanding a greater measure of spiritual discipline and dependence. It reminds us that even those entrusted with God's power can face limitations if their faith is weak or their prayer life is lacking, pointing to the ongoing need for spiritual growth and humility in ministry.

  • Mark 9:28-29 – Mark's parallel account adds Jesus' specific mention of prayer (and fasting in some manuscripts) as necessary for this kind of demon.
  • Luke 17:5-6 – Jesus' teaching on faith, even as small as a mustard seed, having the power to move mountains, echoes the principle He teaches here.
  • James 5:16 – Emphasizes the power of a righteous person's prayer, connecting effective spiritual action to a life of prayer.

REFLECTION AND APPLICATION

The disciples' honest question in Matthew 17:19 resonates deeply with believers today. We often experience moments of spiritual frustration or perceived failure when our efforts, even those undertaken with good intentions and a desire to serve God, seem to fall short. This verse invites us to humbly acknowledge our limitations and to turn to Jesus, the ultimate source of all power and wisdom, with our "why" questions. It teaches us that spiritual effectiveness is not merely about having authority, but about cultivating a vibrant, dependent relationship with Christ through unwavering faith and persistent prayer. When we encounter obstacles that seem insurmountable, instead of despairing, we are called to seek deeper understanding from our Master, allowing our failures to become catalysts for profound spiritual growth and a renewed reliance on His limitless power.

Questions for Reflection

  • What "failures" or spiritual roadblocks have you encountered that prompted you to ask "Why could not I?"
  • How does your immediate response to spiritual limitations compare to the disciples' approach to Jesus?
  • In what areas of your life or ministry do you need to cultivate a deeper dependence on Jesus through faith and prayer?
  • How can acknowledging your limitations lead to greater spiritual growth and a stronger reliance on God?

FAQ

Why did the disciples, who had previously cast out demons, fail in this instance?

Answer: The text implies that this particular demon, or the spiritual stronghold it represented, was of a more formidable nature, requiring a deeper level of faith and prayer than the disciples had exercised. Jesus' subsequent explanation in Matthew 17:20-21 points to a deficiency in their faith and, according to some manuscripts and the parallel in Mark 9:29, a lack of prayer (and fasting). It wasn't that their authority was revoked, but that their spiritual readiness and reliance on God's power were insufficient for this specific challenge, highlighting that spiritual warfare requires more than just delegated power; it demands a vibrant, active faith and a disciplined prayer life.

What is the significance of the disciples coming to Jesus "apart"?

Answer: The phrase "apart" (Greek: kat' idian) indicates a private, confidential conversation. This suggests several things: the disciples may have felt embarrassed or ashamed of their public failure, wishing to discuss it away from the crowds. It also shows their genuine desire for an honest, unvarnished explanation from Jesus, without the pressure of public scrutiny. This private setting allows for a more intimate and direct teaching moment, where Jesus can address their spiritual shortcomings and deepen their understanding of faith and spiritual power. It underscores their recognition of Jesus as their ultimate teacher and the source of all spiritual truth.

CHRIST-CENTERED FULFILLMENT

Matthew 17:19, with the disciples' bewildered question, beautifully highlights the unique and unparalleled authority of Jesus Christ. Their failure to cast out the demon, contrasted sharply with Jesus' effortless success in Matthew 17:18, underscores that while disciples are granted delegated authority, Jesus possesses inherent, ultimate power over all spiritual forces. He is not merely a conduit of power, but the very source of it, the one who has "all authority in heaven and on earth" (Matthew 28:18). This incident foreshadows His ultimate victory over sin, death, and the devil through His atoning work on the cross (Colossians 2:15), where He disarmed the powers and authorities. Through His resurrection and ascension, Christ continues to reign supreme, and it is only in Him that believers find the true power to overcome spiritual opposition (Ephesians 6:10-12). The disciples' failure, therefore, serves as a poignant reminder that all spiritual power flows from Christ, and our effectiveness in ministry is directly proportional to our abiding in Him and relying on His finished work and ongoing intercession (John 15:5). He is the true deliverer, the one who came "to destroy the works of the devil" (1 John 3:8).

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Commentary on Matthew 17 verses 14–21

I. II. Main points1. 2. Sub-points(1.) (2.) Details

We have here the miraculous cure of a child that was lunatic and vexed with a devil. Observe,

I. A melancholy representation of the case of this child, made to Christ by the afflicted father. This was immediately upon his coming down from the mountain where he was transfigured. Note, Christ's glories do not make him unmindful of us and of our wants and miseries. Christ, when he came down from the mount, where had conversation with Moses and Elias, did not take state upon him, but was as easy of access, as ready to poor beggars, and as familiar with the multitude, as ever he used to be. This poor man's address was very importunate; he came kneeling to Christ. Note, Sense of misery will bring people to their knees. Those who see their need of Christ will be earnest, will be in good earnest, in their applications to him; and he delights to be thus wrestled with.

Two things the father of the child complains of.

1.The distress of his child (Mat 17:15); Lord have mercy on my son. The affliction of the children cannot but affect the tender parents, for they are pieces of themselves. And the case of afflicted children should be presented to God by faithful and fervent prayer. This child's distemper, probably, disabled him to pray for himself. Note, Parents are doubly concerned to pray for their children, not only that are weak and cannot, but much more that are wicked and will not, pray for themselves. Now, (1.). The nature of this child's disease was very sad; He was lunatic and sore vexed. A lunatic is properly one whose distemper lies in the brain, and returns with the change of the moon. The devil, by the divine permission, either caused this distemper, or at least concurred with it, to heighten and aggravate it. The child had the falling-sickness, and the hand of Satan was in it; by it he tormented then, and made it much more grievous than ordinarily it is. Those whom Satan got possession of, he afflicted by those diseases of the body which do most affect the mind; for it is the soul that he aims to do mischief to. The father, in his complain, saith, He is lunatic, taking notice of the effect; but Christ, in the cure, rebuked the devil, and so struck at the cause. Thus he doth in spiritual cures. (2.) The effects of the disease were very deplorable; He oft falls into the fire, and into the water. If the force of the disease made him to fall, the malice of the devil made him to fall into the fire or water; so mischievous is he where he gains possession and power in any soul. He seeks to devour, Pe1 5:8.

2.The disappointment of his expectation from the disciples (Mat 17:16); I brought him to thy disciples, and they could not cured him. Christ gave his disciples power to cast out devils (Mat 10:1, Mat 10:8), and therein they were successful (Luk 10:17); yet at this time they failed in the operation, though there were nine of them together, and before a great multitude. Christ permitted this, (1.) To keep them humble, and to show their dependence upon him, that without him they could do nothing. (2.) To glorify himself and his own power. It is for the honour of Christ to come in with help at a dead-lift, when other helpers cannot help. Elisha's staff in Gehazi's hand will not raise the child: he must come himself. Note, There are some special favours which Christ reserves the bestowment of to himself; and sometimes he keeps the cistern empty; that he may bring us to himself, the Fountain. But the failures of instruments shall not hinder the operations of his grace, which will work, if not by them, yet without them.

II. The rebukes that Christ gave to the people first, and then to the devil.

1.He chid those about him (Mat 17:17); O faithless and perverse generation! This is not spoken to the disciples, but to the people, and perhaps especially to the scribes, who are mentioned in Mar 9:14, and who, as it should seem, insulted over the disciples, because they had now met with a case that was too hard for them. Christ himself could not do many mighty works among a people in whom unbelief reigned. It was here owing to the faithlessness of this generation, that they could not obtain those blessings from God, which otherwise they might have had; as it was owing to the weakness of the disciples' faith, that they could not do those works for God, which otherwise they might have done. They were faithless and perverse. Note, Those that are faithless will be perverse; and perverseness is sin in its worst colours. Faith is compliance with God, unbelief is opposition and contradiction to God. Israel of old was perverse, because faithless (Psa 95:9), forward, for in them is no faith, Deu 32:20.

Two things he upbraids them with. (1.) His presence with them so long; "How long shall I be with you? Will you always need my bodily presence, and never come to such maturity as to be fit to be left, the people to the conduct of the disciples, and the disciples to the conduct of the Spirit and of their commission? Must the child be always carried, and will it never learn to go alone?" (2.) His patience with them so long; How long shall I suffer you? Note, [1.] The faithlessness and perverseness of those who enjoy the means of grace are a great grief to the Lord Jesus. Thus did he suffer the manners of Israel of old, Act 13:18. [2.] The longer Christ has borne with a perverse and faithless people, the more he is displeased with their perverseness and unbelief; and he is God, and not man, else he would not suffer so long, nor bear so much, as he doth.

2.He cured the child, and set him to-rights again. He called, Bring him hither to me. Though the people were perverse, and Christ was provoked, yet care was taken of the child. Note, Though Christ may be angry, he is never unkind, nor doth he, in the greatest of his displeasure, shut up the bowels of his compassion from the miserable; Bring him to me. Note, When all other helps and succours fail, we are welcome to Christ, and may be confident in him and in his power and goodness.

See here an emblem of Christ's undertaking as our Redeemer.

(1.)He breaks the power of Satan (Mat 17:18); Jesus rebuked the devil, as one having authority, who could back with force his word of command. Note, Christ's victories over Satan are obtained by the power of his word, the sword that comes out of his mouth, Rev 19:21. Satan cannot stand before the rebukes of Christ, though his possession has been ever so long. It is comfortable to those who are wrestling with principalities and powers, that Christ hath spoiled them, Col 2:15. The lion of the tribe of Judah will be too hard for the roaring lion that seeks to devour.

(2.)He redresses the grievances of the children of men; The child was cured from that very hour. It was an immediate cure, and a perfect one. This is an encouragement to parents to bring their children to Christ, whose souls are under Satan's power; he is able to heal them, and as willing as he is able. Not only bring them to Christ by prayer, but bring them to the word of Christ, the ordinary means by which Satan's strongholds are demolished in the soul. Christ's rebukes, brought home to the heart, will ruin Satan's power there.

III. Christ's discourse with his disciples hereupon.

1.They ask the reason why they could not cast out the devil at this time (Mat 17:19); They came to Jesus apart. Note, Ministers, who are to deal for Christ in public, have need to keep up a private communion with him, that they may in secret, where no eye sees, bewail their weakness and straitness, their follies and infirmities, in their public performances, and enquire into the cause of them. We should make use of the liberty of access we have to Jesus apart, where we may be free and particular with him. Such questions as the disciples put to Christ, we should put to ourselves, in communing with our own hearts upon our beds; Why were we so dull and careless at such a time? Why came we so much short in such a duty? That which is amiss may, when found out, be amended.

2.Christ gives them two reasons why they failed.

(1.)It was because of their unbelief, Mat 17:20. When he spake to the father of the child and to the people, he charged it upon their unbelief; when he spake to his disciples, he charged it upon theirs; for the truth was, there were faults on both sides; but we are more concerned to hear of our own faults than of other people's, and to impute what is amiss to ourselves than to others. When the preaching of the word seems not to be so successful as sometimes it has been, the people are apt to lay all the fault upon the ministers, and the ministers upon the people; whereas, it is more becoming for each to own his own faultiness, and to say, "It is owing to me." Ministers, in reproving, must learn thus to give to each his portion of the word; and to take people off from judging others, by teaching all to judge themselves; It is because of your unbelief. Though they had faith, yet that faith was weak and ineffectual. Note, [1.] As far as faith falls short of its due strength, vigour, and activity, it may truly be said, "There is unbelief." Many are chargeable with unbelief, who yet are not to be called unbelievers. [2.] It is because of our unbelief, that we bring so little to pass in religion, and so often miscarry, and come short, in that which is good.

Our Lord Jesus takes this occasion to show them the power of faith, that they might not be defective in that, another time, as they were now; If ye have faith as a grain of mustard-seed, ye shall do wonders, Mat 17:20. Some make the comparison to refer to the quality of the mustard-seed, which is, when bruised, sharp and penetrating; "If you have an active growing faith, not dead, flat, or insipid, you will not be baffled thus." But it rather refers to the quantity; "If you had but a grain of true faith, though so little that it were like that which is the least of all seeds, you would do wonders." Faith in general is a firm assent to, a compliance with, and a confidence in, all divine revelation. The faith here required, is that which had for its object that particular revelation by which Christ gave his disciples power to work miracles in his name, for the confirmation of the doctrine they preached. It was a faith in this revelation that they were defective in; either doubting the validity of their commission, or fearing that it expired with their first mission, and was not to continue when they were returning to their Master; or that it was some way or other forfeited or withdrawn. Perhaps their Master's absence with the three chief of his disciples, with a charge to the rest not to follow them, might occasion some doubts concerning their power, or rather the power of the Lord with them, to do this; however, there were not, at present, such a strong actual dependence upon, and confidence in, the promise of Christ's presence with them, as there should have been. It is good for us to be diffident of ourselves and of our own strength; but it is displeasing to Christ, when we distrust any power derived from him or granted by him.

If ye have ever so little of this faith in sincerity, if ye truly rely upon the powers committed to you, ye shall say to this mountain, Remove. This is a proverbial expression, denoting that which follows, and no more, Nothing shall be impossible to you. They had a full commission, among other things, to cast out devils without exception; but, this devil being more than ordinarily malicious and inveterate, they distrusted the power they had received, and so failed. To convince them of this, Christ shows them what they might have done. Note, An active faith can remove mountains, not of itself, but in the virtue of a divine power engaged by a divine promise, both which faith fastens upon.

(2.)Because there was something in the kind of the malady, which rendered the cure more than ordinarily difficult (Mat 17:21); "This kind goes not out but by prayer and fasting. This possession, which works by a falling-sickness, or this kind of devils that are thus furious, is not cast out ordinarily but by great acts of devotion, and wherein ye were defective." Note, [1.] Though the adversaries we wrestle, be all principalities and powers, yet some are stronger than others, and their power more hardly broken. [2.] The extraordinary power of Satan must not discourage our faith, but quicken us to a greater intenseness in the acting of it, and more earnestness in praying to God for the increase of it; so some understand it here; "This kind of faith (which removeth mountains) doth not proceed, is not obtained, from God, nor is it carried up to its full growth, nor drawn out into act and exercise, but by earnest prayer." [3.] Fasting and prayer are proper means for the bringing down of Satan's power against us, and the fetching in of divine power to our assistance. Fasting is of use to put an edge upon prayer; it is an evidence and instance of humiliation which is necessary in prayer, and is a means of mortifying some corrupt habits, and of disposing the body to serve the soul in prayer. When the devil's interest in the soul is confirmed by the temper and constitution of the body, fasting must be joined with prayer, to keep under the body.

Matthew Henry (1662–1714) — Commentary on the Whole Bible. This section covers verses 14–21. Public domain.
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Origen of Alexandria (as quoted by Aquinas, AD 1274)AD 253
Catena Aurea by Aquinas
Of the changefulness of the sinner it is said, The fool changes as the moon. (Ecclus. 27:12.) We may see sometimes that an impulse towards good works comes over such, when, lo! again as by a sudden seizure of a spirit they are laid hold of by their passions, and fall from that good state in which they were supposed to stand. Perhaps his father stands for the Angel to whom was allotted the care of this lunatic, praying the Physician of souls, that He would set free his son, who could not be delivered from his suffering by the simple word of Christ's disciples, because as a deaf person he cannot receive their instruction, and therefore he needs Christ's word, that henceforth he may not act without reason.
Hilary of PoitiersAD 367
The disciples are surprised that they could not throw out the demon. All power, not only of besting demons but even of raising the dead, had been given them. Furthermore, because the law was soon to be transcended, Jesus says, “O faithless and perverse generation, how long am I to be with you?” He does not seem to be saying this to those whom he had set apart. Those who did not have faith were going to lose the very law that they had. If they had had this faith within them, they would have been like the grain of mustard seed. By the power of the Word they would have thrown out this burden of sins and the heavy mass of their unbelief. They would have transferred it, like a mountain into the sea, to the activity of the pagans and secular people.
Hilary of Poitiers (as quoted by Aquinas, AD 1274)AD 367
Catena Aurea by Aquinas
The Apostles had believed, yet their faith was imperfect; while the Lord tarried in the mount, and they abode below with the multitude, then faith had become stagnant.
John Chrysostom (as quoted by Aquinas, AD 1274)AD 407
Catena Aurea by Aquinas
The disciples had received from the Lord the power over unclean spirits, and when they could not heal the dæmoniac thus brought to them, they seem to have had misgivings lest they had forfeited the grace once given to them; hence their question. And they ask it apart, not out of shame, but because of the unspeakable matter of which they were to ask. Jesus said unto them, Because of your unbelief.

Whence it is plain that the disciples' faith was grown weak, yet not all, for those pillars were there, Peter, and James, and John.

But it is to be known, that, as ofttimes the faith of him that draweth near to receive supplies the miraculous virtue, so ofttimes the power of those that work the miracle is sufficient even without the faith of those who sought to receive. (Acts 10:4.) Cornelius and his household, by their faith, attracted to them the grace of the Holy Spirit; but the dead man who was cast into the sepulchre of Elisha, was revived solely by virtue of the holy body. (2 Kings 13:21.) It happened that the disciples were then weak in faith, for indeed they were but in an imperfect condition before the cross; wherefore He here tells them, that faith is the mean of miracles, Verily I say unto you, if ye shall have faith as a grain of mustard-seed, ye shall say to this mountain, Remove hence, and it shall remove.

So He not only promises the removal of mountains, but goes beyond, saying, And nothing shall be impossible to you.

If you shall ask, Where did the Apostles remove mountains? I answer, that they did greater things, bringing many dead to life. It is told also of some saints, who came after the Apostles, that they have in urgent necessity removed mountainsb. But if mountains were not removed in the. Apostles' time, this was not because they could not, but because they would not, there being no pressing occasion. And the Lord said not that they should do this thing, but that they should have power to do it. Yet it is likely that they did do this, but that it is not written, for indeed not all the miracles that they wrought are written.

And this He says not of lunatics in particular, but of the whole class of dæmons. For fast endues with great wisdom, makes a man as an Angel from heaven, and beats down the unseen powers of evil. But there is need of prayer as even still more important. And who prays as he ought, and fasts, had need of little more, and so is not covetous, but ready to almsgiving. For he who fasts, is light and active, and prays wakefully, and quenches his evil lusts, makes God propitious, and humbles his proud stomach. And he who prays with his fasting, has two wings, lighter than the winds themselves. For he is not heavy and wandering in his prayers, (as is the case with many,) but his zeal is as the warmth of fire, and his constancy as the firmness of the earth. Such an one is most able to contend with dæmons, for there is nothing more powerful than a man who prays properly. But if your health be too weak for strict fast, yet is it not for prayer, and if you cannot fast, you can abstain from indulgences. And this is not a little, and not very different from fast.
John ChrysostomAD 407
Homily on the Gospel of Matthew 57
"Then came His disciples unto Him apart, and asked Him, why they could not themselves cast out the devil." To me they seem to be in anxiety and fear, lest haply they had lost the grace, with which they had been entrusted. For they received power against unclean spirits. Wherefore also they ask, coming to Him apart; not out of shame (for if the fact had gone abroad, and they were convicted, it were superfluous after that to be ashamed of confessing it in words); but it was a secret and great matter they were about to ask Him of. What then saith Christ? "Because of your unbelief," saith He; "for if ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove, and it shall remove; and nothing shall be impossible unto you." Now if you say, "Where did they remove a mountain?" I would make this answer, that they did far greater things, having raised up innumerable dead. For it is not at all the same thing, to remove a mountain, and to remove death from a body. And certain saints after them, far inferior to them, are said actually to have removed mountains, when necessity called for it. Whereby we see that these also would have done the same, need calling on them. But if there was then no need for it, do not thou find fault. And besides, He Himself said not, "ye shall surely remove it," but "ye shall be able to do even this." And if they did it not, it was not because they were unable (how could this be, when they had power to do the greater things?), but because they would not, there being no need.

And it is likely that this too may have been done, and not have been written; for we know that not all the miracles they wrought were written. Then however they were in a state by comparison very imperfect. What then? Had they not at that time so much as this faith? They had not, for neither were they always the same men, since even Peter is now pronounced blessed, now reproved; and the rest also are mocked by Him for folly, when they understood not His saying concerning the leaven. And so it was, that then also the disciples were weak, for they were but imperfectly minded before the cross.

But by faith here He means that which related to the miracles, and mentions a mustard seed, to declare its unspeakable power. For though in bulk the mustard seed seem to be small, yet in power it is the strongest of all things. To indicate therefore that even the least degree of genuine faith can do great things, He mentioned the mustard seed; neither by any means did He stop at this only, but added even mountains, and went on beyond that. "For nothing," saith He, "shall be impossible to you."

But do thou herein also marvel at their self-denial, and the might of the Spirit; their self-denial in not hiding their fault, and the might of the Spirit in so leading on by degrees them who had not so much as a grain of mustard seed, that rivers and fountains of faith sprang up within them.

"Howbeit, this kind goeth not out, but by prayer and fasting;" meaning the whole kind of evil spirits, not that of lunatics only.

Seest thou how He now proceeds to lay beforehand in them the foundation of His doctrine about fasting? Nay, argue not with me from rare cases, that some even without fasting have cast them out. For although one might say this, in one or two instances, of them that rebuke the evil spirits, yet for the patient it is a thing impossible, living luxuriously, to be delivered from such madness: this thing being especially necessary for him that is diseased in that way. "And yet, if faith be requisite," one may say, "what need of fasting?" Because, together with our faith, that also brings no small power. For it both implants much strictness, and of a man makes one an angel, and fights against the incorporeal powers: yet not by itself, but prayer too is needed, and prayer must come first.

See, at any rate, how many blessings spring from them both. For he that is praying as he ought, and fasting, hath not many wants, and he that hath not many wants, cannot be covetous; he that is not covetous, will be also more disposed for almsgiving. He that fasts is light, and winged, and prays with wakefulness, and quenches his wicked lusts, and propitiates God, and humbles his soul when lifted up. Therefore even the apostles were almost always fasting. He that prays with fasting hath his wings double, and lighter than the very winds. For neither doth he gape, nor stretch himself, nor grow torpid in prayer, as is the case with most men, but is more vehement than fire, and rises above the earth. Wherefore also such a one is most especially a hater and an enemy to the evil spirits. For nothing is mightier than a man who prays sincerely. For if a woman had power to prevail with a savage ruler, one neither fearing God, nor regarding man; much more will he prevail with God, who is continually waiting upon Him, and controlling the belly, and casting out luxury. But if thy body be too weak to fast continually, still it is not too weak for prayer, nor without vigor for contempt of the belly. For although thou canst not fast, yet canst thou avoid luxurious living; and even this is no little thing, nor far removed from fasting, but even this is enough to pluck down the devil's madness. For indeed nothing is so welcome to that evil spirit, as luxury and drunkenness; since it is both fountain and parent of all our evils.
JeromeAD 420
Commentary on Matthew
(Verse 19.) If you have faith as a grain of mustard seed, you shall say to this mountain: Remove from hence, and it shall remove: and nothing shall be impossible to you. Some people think that faith compared to a grain of mustard seed is small, because the kingdom of heaven is compared to a grain of mustard seed; when the apostle says: And if I shall have all faith, so that I could remove mountains (I Cor. XV, 2). Therefore, great is the faith that is compared to a grain of mustard seed. The translation of the mountain does not signify the one that we see with our physical eyes, but rather the one who has been transferred by the Lord from the lunatic. For when he says, 'You will say to this mountain, "Move from here to there," and it will move,' it is understood to refer to the devil. From this, those are shown to be foolish who argue that the apostles and all believers, did not even have a little faith, because none of them moved mountains. For the movement of a mountain from one place to another is not beneficial in itself, and seeking the vain display of miracles; but this mountain must be moved for the benefit of all, which is said by the prophet to corrupt all the earth (Zech. IV).
Jerome (as quoted by Aquinas, AD 1274)AD 420
Catena Aurea by Aquinas
This is what the Lord says in another place, Whatsoever ye shall ask in my name believing, ye shall receive. (John 16:23.) Therefore when we receive not, it is not the weakness of Him that gives, but the fault of them that ask. Mat. 21:22.)

Some think that the faith that is compared to a grain of mustard-seed is a little faith, whereas the Apostle says, If I shall have such faith that I could remove mountains. (1 Cor. 13:2.) The faith therefore which is compared to a grain of mustard-seed is a great faith.

Or; the mountain is not said of that which we see with the eyes of the body, but signified that spirit which was removed by the Lord out of the lunatic, who is said by the Prophet to be the corrupter of the whole earth,
Augustine of HippoAD 430
SERMON 80.3
In this chapter the Lord urged us to pray when he said, “Because of your little faith you could not cast out this demon.” For urging us to prayer he thus concluded, “This kind does not go out except by prayer and fasting.” If a man prays so that he may throw out someone else’s demon, how much more so that he may cast out his own avarice? How much more so that he may cast out his own drunkenness? How much more so that he may cast out his own dissipation? How much more so that he may cast out his own impurity? How great are the sins in human beings! If they persevere in them, they do not allow them to enter the kingdom of heaven!
Remigius of Rheims (as quoted by Aquinas, AD 1274)AD 533
Catena Aurea by Aquinas
Or, fasting is here understood generally as abstinence not from food only, but from all carnal allurements, and sinful passions. In like manner prayer is to be understood in general as consisting in pious and good acts, concerning which the Apostle speaks, Pray without ceasing. (1 Thess. 5:17.)
Gregory the Dialogist (as quoted by Aquinas, AD 1274)AD 604
Catena Aurea by Aquinas
(Mor. pref. c. 2.) The mustard-seed, unless it be bruised, does not give out its qualities, so if persecution fall upon a holy man, straightway what had seemed weak and contemptible in him is roused into the heat and fervour of virtue.
Rabanus Maurus (as quoted by Aquinas, AD 1274)AD 856
Catena Aurea by Aquinas
For faith gives our minds such a capacity for the heavenly gifts, that whatsoever we will we may easily obtain from a faithful Master.

But while He teaches the Apostles how the dæmon ought to be cast out, He instructs all in regulation of life; that we may all know that all the heavier inflictions, whether of unclean spirits, or temptations of men, may be removed by fasts and prayers; and that the wrath also of the Lord may be appeased by this remedy alone; whence he adds, Howbeit this kind is not cast out but by prayer and fasting.
Theophylact of OhridAD 1107
The apostles were afraid that they had lost the grace against demons that had been given to them; this is why they asked Jesus in private and with great anxiety. But the Lord reproves them for being imperfect in faith, saying, "Because of your unbelief. For if you had fervent, ardent faith, you would accomplish great things even though they appeared to be small." The location of the mountains which the Apostles moved is nowhere recorded, yet it is likely that they did move them, but the event was not written down; for not everything was written down. Or, by another interpretation, they did not move a mountain because there had been no occasion to do so, but they did even greater things than that. Note how the Lord said, Ye shall say unto this mountain, Remove hence, in other words, the mountain shall move when you say the word. But the Apostles did not say the word as there was neither occasion nor necessity, and so they did not move mountains. But if indeed they had spoken, they would have moved. This kind of demon is cast out by prayer and fasting. For they themselves who are demonized must fast, as well as those who would heal them; then comes the prayer, preceded by fasting, not drunkenness. Understand, then, that even perfect faith is as the grain of mustard seed, considered worthless on account of the foolishness of the preaching. Yet if it should find good soil, it grows into a tree in which the winged creatures of heaven, that is, soaring thoughts, may alight. Whoever, then, has perfect faith can say to this mountain, that is, to the demon, Remove hence. For Christ was also referring to the demon that had gone out.
Glossa Ordinaria (as quoted by Aquinas, AD 1274)AD 1274
Catena Aurea by Aquinas
(interlin.) So that the sense then is, Ye shall say to this mountain, that is to the proud devil, Remove hence, that is from the possessed body into the sea, that is into the depths of hell, and it shall remove, and nothing shall be impossible to you, that is, no sickness shall be incurable.

(ord.) Or; This class of dæmons, that is the variety of carnal pleasures, is not overcome unless the spirit be strengthened by prayer, and the flesh enfeebled by fast.
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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