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Translation
King James Version
Lord, have mercy on my son: for he is lunatick, and sore vexed: for ofttimes he falleth into the fire, and oft into the water.
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KJV (with Strong's)
Lord G2962, have mercy G1653 on my G3450 son G5207: for G3754 he is lunatick G4583, and G2532 sore G2560 vexed G3958: for G1063 ofttimes G4178 he falleth G4098 into G1519 the fire G4442, and G2532 oft G4178 into G1519 the water G5204.
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Complete Jewish Bible
and said, "Sir, have mercy on my son, because he is an epileptic and has such terrible fits that he often falls into the fire or into the water.
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Berean Standard Bible
“Lord, have mercy on my son,” he said. “He has seizures and is suffering terribly. He often falls into the fire or into the water.
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American Standard Version
Lord, have mercy on my son: for he is epileptic, and suffereth grievously; for oft-times he falleth into the fire, and oft-times into the water.
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World English Bible Messianic
“Lord, have mercy on my son, for he is epileptic, and suffers grievously; for he often falls into the fire, and often into the water.
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Geneva Bible (1599)
And saide, Master, haue pitie on my sonne: for he is lunatike, and is sore vexed: for oft times he falleth into the fire, and oft times into the water.
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Young's Literal Translation
and saying, `Sir, deal kindly with my son, for he is lunatic, and doth suffer miserably, for often he doth fall into the fire, and often into the water,
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In the KJVVerse 23,716 of 31,102

Study This Verse

SUMMARY

Matthew 17:15 captures the desperate plea of a father to Jesus, seeking compassion and healing for his severely afflicted son. The father describes his son's condition as "lunatick" and "sore vexed," detailing life-threatening symptoms such as frequently falling into fire and water. This poignant appeal highlights the profound suffering caused by illness and spiritual oppression, setting the stage for Jesus to demonstrate His divine authority and compassionate power in a situation where His disciples had previously failed.

CONTEXT

  • Literary Context: This verse immediately follows the glorious event of the Transfiguration, where Jesus revealed His divine glory to Peter, James, and John on a high mountain. While Jesus and these three disciples were on the mountain, the other disciples remained below, attempting to minister to the crowds. Upon descending, Jesus is met by a large crowd and this distressed father, whose son the remaining disciples had been unable to heal. This narrative juxtaposition starkly contrasts the sublime revelation of Christ's glory with the grim reality of human suffering and the disciples' spiritual limitations, thereby emphasizing Jesus' unique authority and power as He steps back into the world's brokenness. The father's plea directly precedes Jesus' rebuke of the demon and the subsequent healing of the boy, as recorded in Matthew 17:18, and a crucial teaching on faith and prayer in Matthew 17:19-21.
  • Historical & Cultural Context: In ancient Jewish society, severe physical and mental ailments, particularly those involving seizures, self-destructive behavior, or periods of irrationality, were often attributed to demonic possession or divine judgment. The term "lunatick" (Greek selēniazomai) reflects a common ancient belief that such conditions were influenced by the phases of the moon, though the biblical text, especially in parallel accounts like Mark 9:14-29, clarifies that this particular case was indeed caused by a demon. Medical understanding was rudimentary, and the community's primary recourse for such severe and inexplicable conditions was often spiritual intervention. The father's action of bringing his son to the disciples first, and then to Jesus, reflects the common practice of seeking healing from spiritual authorities, especially those known for miraculous powers. The public nature of this encounter, immediately after Jesus' descent from the mountain, also underscores the societal expectation of divine intervention in times of crisis.
  • Key Themes: Matthew 17:15 contributes to several overarching themes within the Gospel of Matthew and the broader biblical narrative. Firstly, it powerfully illustrates the theme of Human Suffering and Desperation, vividly portraying the devastating impact of illness and spiritual bondage on individuals and families, and the profound need for divine intervention. Secondly, it highlights the Authority and Compassion of Jesus, as the father's plea acknowledges Jesus' unique ability to bring healing and deliverance where others have failed, underscoring His role as the Great Physician. This event, particularly when viewed alongside the disciples' inability to heal, also develops the theme of Faith and Discipleship, revealing the limitations of human effort without genuine faith and reliance on God's power, a point Jesus directly addresses in Matthew 17:20. Finally, the narrative foreshadows Jesus' ultimate victory over all forms of evil and suffering, aligning with the broader theme of the Establishment of God's Kingdom through Christ's power and presence.

EXPOSITION AND ANALYSIS

Key Word Analysis

  • Lord (Greek, kýrios, G2962): This term signifies supreme authority and mastery. When the father addresses Jesus as "Lord," he is not merely using a polite form of address but recognizing Jesus' preeminent status and power, acknowledging Him as one who possesses the authority to intervene in such a desperate situation. It is a title of respect, reverence, and often, an implicit recognition of divine or messianic authority.
  • mercy (Greek, eleéō, G1653): This word means to compassionate, to show pity, or to have mercy, often by word or deed. It encompasses both a feeling of deep sympathy and the active expression of that sympathy through help or relief. The father's plea for "mercy" is not for justice or a right, but for unmerited favor and compassionate intervention, acknowledging his son's dire need and Jesus' benevolent character.
  • lunatick (Greek, selēniázomai, G4583): Literally meaning "moon-struck," this term refers to a condition believed in ancient times to be influenced by the moon's phases, often associated with epilepsy, seizures, or mental illness. While the term itself points to a common ancient medical belief, the biblical context, particularly Jesus' subsequent actions, reveals that the underlying cause of the boy's severe symptoms was demonic oppression, which manifested with symptoms akin to what was then called "lunacy."

Verse Breakdown

  • "Lord, have mercy on my son:" This opening phrase is a profound and direct appeal, immediately establishing the father's desperation and his recognition of Jesus' unique authority. The address "Lord" (Kýrios) conveys reverence and an understanding of Jesus' power. The plea for "mercy" (eleéō) is a humble request for compassionate intervention, acknowledging the son's dire state and the father's inability to help him. It is a cry for unmerited favor from one who has the power to grant it.
  • "for he is lunatick, and sore vexed:" Here, the father provides the reason for his plea, describing the nature of his son's affliction. "Lunatick" (selēniázomai) points to symptoms resembling epilepsy or severe mental disturbance, often associated with the moon's influence in ancient understanding. The phrase "sore vexed" (kakōs páschō) emphasizes the intense, painful, and persistent suffering the boy endures, indicating a deep and tormenting affliction beyond mere physical discomfort. This combination vividly portrays the severity and distressing nature of the boy's condition.
  • "for ofttimes he falleth into the fire, and oft into the water." This clause provides harrowing details of the son's self-destructive tendencies, illustrating the life-threatening consequences of his condition. The repetition of "ofttimes" (pollákis) underscores the frequency and chronic nature of these dangerous episodes. Falling into fire and water signifies extreme peril and the constant threat of accidental death, highlighting the family's relentless anguish and the son's utter vulnerability. These vivid descriptions amplify the urgency and gravity of the father's appeal for Jesus' immediate and powerful intervention.

Literary Devices

The passage employs several powerful literary devices to convey the urgency and pathos of the situation. Pathos is immediately evident in the father's desperate plea, "Lord, have mercy on my son," which evokes deep sympathy for his suffering and the son's plight. The vivid description of the son's condition—"falleth into the fire, and oft into the water"—uses Imagery to paint a stark and terrifying picture of extreme danger and suffering, emphasizing the severity of the affliction. The use of "ofttimes" and "oft" demonstrates Repetition, which serves to underscore the chronic and relentless nature of the boy's attacks, highlighting the family's prolonged anguish and the constant threat to the son's life. Furthermore, the narrative implicitly uses Contrast between the disciples' inability to heal the boy (implied by the father bringing him to Jesus) and Jesus' impending demonstration of ultimate authority and power, thereby magnifying Christ's unique divine capabilities.

THEOLOGICAL AND THEMATIC CONNECTIONS

Matthew 17:15 serves as a profound theological statement on the nature of human suffering and the divine response. It underscores humanity's utter helplessness in the face of severe affliction, whether physical, mental, or spiritual, and points to Jesus Christ as the sole source of true healing and deliverance. The father's cry for "mercy" is a model of humble, dependent faith, acknowledging Jesus' sovereign power and compassionate heart. This passage affirms Jesus' authority over all forms of sickness and demonic oppression, demonstrating that His kingdom brings liberation from the forces of darkness and the brokenness of this world. It also subtly critiques the limitations of human effort and highlights the necessity of divine intervention, setting the stage for Jesus' teaching on the power of faith and prayer.

  • Mark 9:22 - A parallel account where the father expresses his desperate hope, "If you can do anything, have compassion on us and help us."
  • Luke 9:42 - Another parallel account, emphasizing Jesus' rebuke of the unclean spirit.
  • Hebrews 4:16 - Encourages believers to "come boldly to the throne of grace, that we may obtain mercy and find grace to help in time of need," echoing the father's desperate plea for mercy.

REFLECTION AND APPLICATION

The father's desperate plea in Matthew 17:15 resonates deeply with the human experience of suffering and helplessness. In moments of profound crisis—whether facing a debilitating illness, a child's struggle, or seemingly insurmountable obstacles—we often find ourselves at the end of our own resources, much like this father. His immediate turn to Jesus, bypassing others who had failed, serves as a powerful reminder that our ultimate hope and source of help reside in Christ alone. This passage invites us to bring our deepest pains, our most overwhelming burdens, and our most desperate prayers directly to Jesus, trusting in His boundless compassion and unparalleled power. It challenges us to cultivate a faith that, even amidst despair, believes in Jesus' ability to intervene miraculously, to heal, and to deliver, reminding us that no condition is too severe for His touch. Our response to suffering should be one of humble, persistent, and expectant prayer, knowing that the Lord who had mercy on the "lunatick" boy is the same Lord who hears our cries today.

Questions for Reflection

  • What desperate situations in your life or the lives of those you love are you called to bring before Jesus with a plea for mercy?
  • How does the father's immediate turning to Jesus, despite others' failure, challenge your own reliance on human solutions versus divine intervention?
  • In what ways can you cultivate a deeper trust in Jesus' compassion and power, even when circumstances seem hopeless?
  • How might this passage encourage you to pray more persistently and specifically for those who are suffering from severe physical, mental, or spiritual afflictions?

FAQ

Was the boy truly "lunatick" or demon-possessed?

Answer: While the KJV uses the term "lunatick" (Greek selēniázomai), which literally means "moon-struck" and was a common ancient term for conditions like epilepsy or mental illness believed to be influenced by the moon, the parallel accounts in Mark 9:14-29 and Luke 9:37-43 explicitly state that Jesus rebuked and cast out an unclean spirit or demon from the boy. This indicates that while the symptoms manifested as what was then called "lunacy" or epilepsy (falling into fire and water, foaming at the mouth, grinding teeth), the underlying cause, in this specific case, was demonic oppression. Jesus' action of rebuking the demon confirms the spiritual nature of the affliction, demonstrating His authority over evil spirits.

CHRIST-CENTERED FULFILLMENT

Matthew 17:15, with its raw depiction of human suffering and a father's desperate plea, finds its ultimate fulfillment in the person and work of Jesus Christ. The "Lord" to whom the father appeals is not merely a powerful healer, but the Son of God, the Messiah, whose very mission is to bring light into darkness and healing to the broken. This scene foreshadows Christ's comprehensive victory over all the consequences of sin: sickness, suffering, and spiritual bondage. His compassion for the afflicted boy and His subsequent powerful deliverance (as seen in Matthew 17:18) are tangible expressions of His kingdom breaking into a fallen world. Jesus, as the true Lamb of God, would ultimately take upon Himself the "sore vexation" of humanity's sin and suffering on the cross, offering a definitive and eternal solution to the spiritual and physical maladies that plague us (Isaiah 53:4-5). His authority over the demon and the illness points forward to His ultimate triumph over Satan and death itself through His resurrection (Colossians 2:15), offering not just temporary relief but eternal redemption and the promise of a new creation where "there will be no more death or mourning or crying or pain" (Revelation 21:4). Thus, the father's cry for mercy is met by the One who is mercy incarnate, the Savior who delivers us from all forms of vexation and brings us into His glorious light.

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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 AlexandriaAD 253
COMMENTARY ON MATTHEW 13.4
If every disease and weakness which our Savior cured at that time among the people represents different symptoms in the soul, it stands to reason that by the paralytics are symbolized the palsied in soul, who keep it lying paralyzed in the body. By those who are blind are symbolized those who are blind in respect of things seen by the soul alone, and these are really blind. And by the deaf are symbolized those who are deaf in regard to the reception of the word of salvation. On the same principle it will be necessary that the matters regarding the epileptic should be investigated. This disease attacks those who suffer from it at considerable intervals, during which time he who suffers from it seems in no way to differ from the man in good health, at the season when the epilepsy is not working on him. You will find some souls that are often considered to be healthy suffering from symptoms like these in their chastity and the other virtues. But there comes a time when they are attacked by a kind of epilepsy, and then they seem to fall from their solid foundation and are seized by the deceits and other desires of this world.
Origen of Alexandria (as quoted by Aquinas, AD 1274)AD 253
Catena Aurea by Aquinas
Peter, anxious for such desirable life, and preferring his own benefit to that of many, had said, It is good for us to be here. But since charity seeks not her own, Jesus did not this which seemed good to Peter, but descended to the multitude, as it were from the high mount of His divinity, that He might be of use to such as could not ascend because of the weakness of their souls; whence it is said, And when he was come to the multitude; for if He had not gone to the multitude with His elect disciples, there would not have come near to Him the man of whom it is added, There came to him a man kneeling down, and saying, Lord, have mercy on my son. Consider here, that sometimes those that are themselves the sufferers believe and entreat for their own healing, sometimes others for them, as he who kneels before Him praying for his son, and sometimes the Saviour heals of Himself unasked by any. First, let us see what this means that follows, For he is lunatic, and sore vexed. Let the physicians talk as they list, for they think it no unclean spirit, but some bodily disorder, and say, that the humours in the head are governed in their motions by sympathy with the phases of the moon, whose light is of the nature of humours. But we who believe the Gospel say that it is an unclean spirit that works such disorders in men. The spirit observes the moon's changes, that it may cheat men into the belief that the moon is the cause of their sufferings, and so prove God's creation to be evil; as other dæmons lay wait for men following the times and courses of the stars, that they may speak wickedness in high places, calling some stars malignant, others benign; whereas no star was made by God that it should produce evil. In this that is added, For ofttimes he falls into the fire, and oft into the water,
John ChrysostomAD 407
Homily on the Gospel of Matthew 57
"And when they were come to the multitude, there came to Him a man, kneeling down to Him, and saying, Lord, have mercy on my son, for he is lunatic, and sore vexed; for ofttimes he falleth into the fire, and oft into the water. And I brought him unto Thy disciples, and they could not cure him."

This man the Scripture signifies to be exceedingly weak in faith; and this is many ways evident; from Christ's saying, "All things are possible to him that believeth;" from the saying of the man himself that approached, "Help Thou mine unbelief:" from Christ's commanding the devil to "enter no more into him;" and from the man's saying again to Christ, "If Thou canst." "Yet if his unbelief was the cause," it may be said, "that the devil went not out, why doth He blame the disciples?" Signifying, that even without persons to bring the sick in faith, they might in many instances work a cure. For as the faith of the person presenting oftentimes availed for receiving the cure, even from inferior ministers; so the power of the doers oftentimes sufficed, even without belief in those who came to work the miracle.

And both these things are signified in the Scripture. For both they of the company of Cornelius by their faith drew unto themselves the grace of the Spirit; and in the case of Eliseus again, when none had believed, a dead man rose again. For as to those that cast him down, not for faith but for cowardice did they cast him, unintentionally and by chance, for fear of the band of robbers, and so they fled: while the person himself that was cast in was dead, yet by the mere virtue of the holy body the dead man arose.

Whence it is clear in this case, that even the disciples were weak; but not all; for the pillars were not present there. And see this man's want of consideration, from another circumstance again, how before the multitude he pleads to Jesus against His disciples, saying, "I brought him to Thy disciples, and they could not cure him."

But He, acquitting them of the charges before the people, imputes the greater part to him. For, "O faithless and perverse generation," these are His words, "how long shall I be with you?" not aiming at his person only, lest He should confound the man, but also at all the Jews. For indeed many of those present might probably be offended, and have undue thoughts of them.

But when He said, "How long shall I be with you," He indicates again death to be welcome to Him, and the thing an object of desire, and His departure longed for, and that not crucifixion, but being with them, is grievous.

He stopped not however at the accusations; but what saith He? "Bring him hither to me." And Himself moreover asks him, "how long time he is thus;" both making a plea for His disciples, and leading the other to a good hope, and that he might believe in his attaining deliverance from the evil.

And He suffers him to be torn, not for display (accordingly, when a crowd began to gather, He proceeded to rebuke him), but for the father's own sake, that when he should see the evil spirit disturbed at Christ's mere call, so at least, if in no other way, he might be led to believe the coming miracle.

And because he had said, "Of a child," and, "If thou canst help me," Christ saith, "To him that believeth, all things are possible," again giving the complaint a turn against him. And whereas when the leper said, "If Thou wilt, Thou canst make me clean," bearing witness to His authority Christ commending him, and confirming His words, said, "I will, be thou clean;" in this man's case, upon his uttering a speech in no way worthy of His power,-"If Thou canst, help me,"-see how He corrects it, as not rightly spoken. For what saith He? "If thou canst believe, all things are possible to him that believeth." What He saith is like this: "Such abundance of power is with me, that I can even make others work these miracles. So that if thou believe as one ought, even thou thyself art able," saith He, "to heal both this one, and many others." And having thus said, He set free the possessed of the devil.

But do thou not only from this observe His providence and His beneficence, but also from that other time, during which He allowed the devil to be in him. Since surely, unless the man had been favored with much providential care even then, he would have perished long ago; for "it cast him both into the fire," so it is said, "and into the water." And he that dared this would assuredly have destroyed the man too, unless even in so great madness God had put on him His strong curb: as indeed was the case with those naked men that were running in the deserts and cutting themselves with stones.

And if he call him "a lunatic," trouble not thyself at all, for it is the father of the possessed who speaks the word. How then saith the evangelist also, "He healed many that were lunatic?" Denominating them according to the impression of the multitude. For the evil spirit, to bring a reproach upon nature, both attacks them that are seized, and lets them go, according to the courses of the moon; not as though that were the worker of it;-away with the thought;-but himself craftily doing this to bring a reproach on nature. And an erroneous opinion hath gotten ground among the simple, and by this name do they call such evil spirits, being deceived; for this is by no means true.
John Chrysostom (as quoted by Aquinas, AD 1274)AD 407
Catena Aurea by Aquinas
is to be noted, that were not man fortified here by Providence, he would long since have perished; for the dæmons who cast him into the fire, and into the water, would have killed him outright, had God not restrained him.

See herein also his folly, in that before the multitude he appeals to Jesus against His disciples. But He clears them from shame, inputing their failure to the patient himself; for many things show that he was weak in faith. But He addresses His reproof not to the man singly, that He may not trouble him, but to the Jews in general. For many of those present, it is likely, had improper thoughts concerning the disciples, and therefore it follows, Jesus answered and said, O faithless and perverse generation, how long shall I be with you, how long shall I suffer you? His How long shall I be with you? shows that death was desired by Him, and that He longed for His withdrawal.

When He had vindicated His disciples, He leads the boy's father to a cheering hope of believing that he shall be delivered out of this evil and that the father might be led to believe the miracle that was coming, seeing the dæmons was disturbed even when the child was only called;
JeromeAD 420
Commentary on Matthew
(Vers. 14, 15.) Lord, have mercy on my son, for he is a lunatic and suffers greatly: for he often falls into fire and frequently into water. And I brought him to your disciples, but they could not heal him. This is why the devil, observing the course of the moon, seizes upon men and strives to defame the Creator through His creatures, as we have said above. But it seems to me, according to the spiritual interpretation, that the lunatic is one who is constantly changing to vice in the moments of the hours, not persisting in what he has begun, but growing and diminishing: and now he is carried to the fire, by which the hearts of adulterers are inflamed (Hosea VII): now to the waters, which cannot quench charity. But when he says, 'I brought him to your disciples, and they could not heal him,' he secretly accuses the apostles, since the inability to heal sometimes refers not to the weakness of those who are healing, but to the faith of those who are being healed, as the Lord says, 'Let it be done to you according to your faith' (Mark 5:34, and 10:52).
Jerome (as quoted by Aquinas, AD 1274)AD 420
Catena Aurea by Aquinas
In saying, And I brought him to thy disciples, and they could not heal him, he covertly accuses the Apostles, whereas that a cure is impossible is sometimes the effect not of want of power in those that undertake it, but of want of faith in those that are to be healed,

Not that we must think that He was overcome by weariness of them, and that The meek and gentle broke out into words of wrath, but as a physician who might see the sick man acting against his injunctions, would say, How long shall I frequent your chamber? How long throw away the exercise of my skill, while I prescribe one thing, and you do another? That it is the sin, and not the man with whom He is angry, and that in the person of this one man He convicts the Jews of unbelief, is clear from what He adds, Bring him to me.

He rebuked him, that is, not the sufferer, but the dæmons.

Or, His reproof was to the child, because for his sins he had been seized on by the dæmons.
Augustine of Hippo (as quoted by Aquinas, AD 1274)AD 430
Catena Aurea by Aquinas
(Quaest. Ev. i. 22.) Or the fire pertains to anger, which aims upwards, water to the lusts of the flesh.
Remigius of Rheims (as quoted by Aquinas, AD 1274)AD 533
Catena Aurea by Aquinas
It may be known also, that not now for the first time, but of a long time, the Lord had borne the Jews' stubbornness, whence He says, How long shall I suffer you? because I have now a long while endured your iniquities, and ye are unworthy of My presence.

In which deed He left an example to preachers to attack sins, but to assist men.
Rabanus Maurus (as quoted by Aquinas, AD 1274)AD 856
Catena Aurea by Aquinas
The lunatic is figuratively one who is hurried into fresh vices every hour, one while is cast into the fire, with which the hearts of the adulterers burn; or again into the waters of pleasures or lusts, which yet have not strength to quench love. (Hos. 7:4, 6.)
Theophylact of OhridAD 1107
. That this man is exceedingly faithless is clear from the words which Christ spoke in reply to him, "O faithless generation," and from the fact that the man himself blamed the disciples. The moon was not the cause, but rather, the demon would take note when the moon was full, and then would set upon his victim, so that men would blaspheme the created works of God as maleficent. You, then, O reader, understand that it is a foolish man that changes as the moon, as it is written (Sirach 27:11), at times waxing great in virtue, at other times waning and vanishing altogether. Then the foolish man becomes deranged and falls down into the fire of anger and lust, and into water, that is, the waves of the many cares of life, in which Leviathan the devil dwells, he who reigns over the waters. For are not the cares of the rich like waves that follow each other in quick succession?
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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