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Translation
King James Version
And he said unto them, This kind can come forth by nothing, but by prayer and fasting.
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KJV (with Strong's)
And G2532 he said G2036 unto them G846, This G5124 kind G1085 can G1410 come forth G1831 by G1722 nothing G3762, but G1508 by G1722 prayer G4335 and G2532 fasting G3521.
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Complete Jewish Bible
He said to them "This is the kind of spirit that can be driven out only by prayer."
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Berean Standard Bible
Jesus answered, “This kind cannot come out, except by prayer.”
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American Standard Version
And he said unto them, This kind can come out by nothing, save by prayer.
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World English Bible Messianic
He said to them, “This kind can come out by nothing, except by prayer and fasting.”
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Geneva Bible (1599)
And he saide vnto them, This kinde can by no other meanes come foorth, but by prayer and fasting.
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Young's Literal Translation
And he said to them, `This kind is able to come forth with nothing except with prayer and fasting.'
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In the KJVVerse 24,568 of 31,102

Study This Verse

SUMMARY

In Mark 9:29, Jesus provides a profound explanation to His disciples regarding their inability to cast out a particularly stubborn demon. This verse serves as a critical teaching on the nature of spiritual warfare, emphasizing that certain deeply entrenched spiritual strongholds cannot be overcome by ordinary means or human effort alone, but require a heightened level of spiritual engagement through dedicated prayer and, notably, fasting. It underscores the essential dependence of believers on divine power, accessed through disciplined spiritual practices, for effective ministry in the face of formidable spiritual opposition.

CONTEXT

  • Literary Context: This verse is situated immediately after a pivotal and somewhat embarrassing incident for Jesus' disciples. They had been given authority to cast out demons (as seen in Mark 6:7), yet they failed spectacularly to deliver a demon-possessed boy, leading to public questioning and a challenge to their spiritual authority. Jesus, upon arriving, effortlessly casts out the demon, demonstrating His supreme power. Privately, the disciples approach Jesus with the direct question, "Why could not we cast him out?" (Mark 9:28). Jesus' response in Mark 9:29 directly addresses their failure, providing a crucial insight into the spiritual power dynamics at play and the necessary disciplines for effective spiritual ministry. It contrasts their human limitations with the divine enablement available through specific spiritual practices.
  • Historical & Cultural Context: In 1st-century Jewish society, demon possession was a recognized phenomenon, and exorcism was practiced, though often with limited success by Jewish exorcists (e.g., Acts 19:13-16). Fasting was a well-established spiritual discipline, practiced for repentance, mourning, seeking divine intervention, or preparing for spiritual encounters. The Day of Atonement (Leviticus 23:27-32) mandated a fast, and individuals or groups would fast in times of crisis or intense prayer (e.g., Daniel 9:3). Prayer was, of course, central to Jewish piety. Jesus' teaching here connects these traditional practices to the specific context of spiritual warfare, indicating that for certain "kinds" of spiritual opposition, a deeper level of spiritual consecration and dependence on God, expressed through both prayer and fasting, was required.
  • Key Themes: Mark 9:29 contributes significantly to several key themes within Mark's Gospel and broader biblical theology. Firstly, it highlights the supremacy of Jesus' authority over all spiritual forces, even those that prove resistant to His disciples. Secondly, it underscores the reality and power of spiritual warfare, indicating that not all demonic opposition is of the same intensity, and some require extraordinary spiritual measures. Thirdly, it emphasizes dependence on God rather than human ability or inherent authority; the disciples' failure stemmed from a lack of sufficient reliance on divine power, which prayer and fasting facilitate. Finally, it teaches the necessity of spiritual disciplines for effective ministry, suggesting that personal spiritual readiness and a consecrated life are prerequisites for wielding divine power against entrenched evil, aligning with the call to "put on the whole armour of God" found in Ephesians 6:10-18.

EXPOSITION AND ANALYSIS

Key Word Analysis

  • kind (Greek, génos', G1085): This word refers to a "kin," "generation," or "species." In this context, it denotes a specific category or type of evil spirit. Jesus' use of "this kind" implies that there are varying degrees of demonic power or entrenchment, and some spiritual entities are more resistant to expulsion than others. It suggests a qualitative difference in the spiritual opposition faced by the disciples.
  • come forth (Greek, exérchomai', G1831): Meaning "to issue," "come out," or "depart," this verb describes the expulsion or departure of the demonic entity from the possessed individual. It emphasizes the active and forceful nature of the exorcism, indicating that the spirit must be compelled to leave, and for "this kind," a greater spiritual force is required to achieve this departure.
  • prayer (Greek, proseuchḗ', G4335): This term signifies "prayer" or "worship," often implying earnest supplication. It points to the essential act of communicating with God, seeking His power and intervention. Jesus identifies prayer as a non-negotiable means for overcoming stubborn spiritual opposition, highlighting the absolute dependence on God's power rather than human strength or technique in spiritual warfare.

Verse Breakdown

  • "And he said unto them,": This clause establishes Jesus as the speaker and the disciples as the direct recipients of this crucial teaching. It signifies a private instruction given in response to their specific failure and question, indicating its importance for their future ministry.
  • "This kind can come forth by nothing,": Jesus identifies a specific category of spiritual entity ("this kind") that is exceptionally resistant. The phrase "by nothing" (Greek: oudeís combined with en for instrumentality) emphatically states that human effort, inherent authority, or conventional methods are utterly insufficient to expel such a spirit. It highlights the disciples' powerlessness in this particular situation without a deeper spiritual engagement.
  • "but by prayer and fasting.": This clause provides the exclusive means by which "this kind" of demon can be overcome. The conjunction "but" (Greek: ei mḗ) introduces the sole exception to the preceding negative statement, presenting prayer and fasting as the indispensable disciplines. This pairing signifies a profound spiritual earnestness, dependence on God, and a willingness to sacrifice personal comfort to align with divine power for effective spiritual warfare.

Literary Devices

Mark 9:29 employs several literary devices to convey its powerful message. The most prominent is Hyperbole, particularly in the phrase "by nothing, but by prayer and fasting." While not strictly literal that absolutely nothing else would work (Jesus Himself cast it out effortlessly), the exaggerated language emphasizes the extreme difficulty and the absolute necessity of these spiritual disciplines for the disciples. This creates a stark Contrast between the disciples' human inadequacy and the divine power accessible through prayer and fasting. The entire statement functions as a piece of Didacticism, a direct teaching by Jesus to His disciples, designed to instruct them on the true nature of spiritual authority and the means by which it is effectively exercised. The specific mention of "this kind" also suggests a form of Categorization, implying a hierarchy or varying degrees of spiritual opposition that require different levels of spiritual readiness.

THEOLOGICAL AND THEMATIC CONNECTIONS

Mark 9:29 is a cornerstone passage for understanding the dynamics of spiritual warfare and the indispensable role of spiritual disciplines. It reveals that while believers are indeed given authority over evil spirits through Christ, the effective exercise of this authority, particularly against deeply entrenched or "stubborn" spiritual strongholds, requires a profound and active dependence on God. This dependence is cultivated through prayer, which is a direct appeal to God's power and sovereignty, and fasting, which signifies a heightened level of earnestness, self-denial, and consecration, aligning the believer's will and spirit more fully with God's. The verse underscores that victory in spiritual battles is not achieved by human might or cleverness, but by God's power flowing through consecrated vessels. It calls believers to a deeper, more intentional pursuit of God's presence and power, acknowledging that some spiritual victories demand an extraordinary spiritual commitment.

REFLECTION AND APPLICATION

Mark 9:29 serves as a powerful and enduring challenge to believers today, reminding us that many of the struggles we face, whether personal, communal, or societal, have a spiritual dimension that cannot be overcome by purely natural means. It calls us beyond superficial faith to a deeper, more consecrated walk with God. When confronted with persistent sin patterns, entrenched spiritual strongholds, or seemingly insurmountable obstacles, this verse urges us to assess our spiritual readiness. It teaches us that true spiritual authority is not a static possession but a dynamic relationship of dependence on God, nurtured through consistent and fervent prayer. Furthermore, the inclusion of fasting suggests that there are times when we must go beyond our comfort zones, denying the flesh and intensifying our spiritual focus, to break through stubborn spiritual resistance. This is not about earning God's favor, but about aligning ourselves more fully with His will and power, demonstrating our earnestness and absolute reliance on Him for victory. It encourages us to engage in spiritual warfare with intentionality, humility, and a deep understanding that our power comes solely from God.

Questions for Reflection

  • What "kinds" of spiritual strongholds or persistent challenges in my life or community seem resistant to ordinary prayer?
  • How does my current prayer life reflect a deep dependence on God for spiritual victories, rather than reliance on my own strength or wisdom?
  • In what ways might incorporating fasting, or a deeper form of spiritual discipline, enhance my spiritual sensitivity and effectiveness in addressing difficult situations?
  • Am I willing to go beyond my spiritual comfort zone to engage in more intense spiritual disciplines when faced with formidable spiritual opposition?

FAQ

Is the phrase "and fasting" original to Mark 9:29, or was it added later?

Answer: The textual authenticity of "and fasting" in Mark 9:29 is a subject of scholarly debate. While it is present in the King James Version and many other ancient manuscripts (including the Byzantine text type, which forms the basis for the Textus Receptus), some of the earliest and most reliable manuscripts (such as Codex Sinaiticus and Vaticanus) omit "and fasting," reading simply "This kind can come forth by nothing, but by prayer." Many modern translations (e.g., NIV, ESV, NASB) either omit it or include it in a footnote, indicating the textual variant. Regardless of its originality in this specific verse, the theological principle of prayer and fasting as powerful spiritual disciplines is well-attested throughout the Bible, both in Jesus' own practice (Matthew 4:2) and in the early church (Acts 13:2-3). Therefore, while the precise wording in Mark 9:29 may be debated, the spiritual truth it conveys remains biblically sound.

CHRIST-CENTERED FULFILLMENT

Mark 9:29, while a direct instruction to the disciples, finds its ultimate fulfillment and meaning in Christ Himself. Jesus, the Son of God, is the embodiment of perfect dependence on the Father, living a life marked by profound prayer and, at times, fasting (Matthew 4:2). His effortless expulsion of the demon, where His disciples failed, powerfully demonstrates His inherent and supreme authority over all "kinds" of evil spirits (Colossians 2:15). The passage implicitly points to the truth that only through union with Christ can believers access the power necessary for such spiritual victories. We do not overcome by our own strength or spiritual disciplines in isolation, but by participating in His victory and drawing upon His limitless power. Our prayer and fasting are not means to earn power, but expressions of our reliance on the One who has already triumphed over every principality and power on the cross (Hebrews 2:14-15). Thus, Mark 9:29 ultimately calls us to abide in Christ (John 15:5), for it is His authority that we exercise, and His Spirit who empowers us, enabling us to confront and overcome "this kind" of spiritual opposition through a life consecrated to Him.

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Commentary on Mark 9 verses 14–29

We have here the story of Christ casting the devil out of a child, somewhat more fully related than it was in Mat 17:14, etc. Observe here,

I. Christ's return to his disciples, and the perplexity he found them in. He laid aside his robes of glory, and came to look after his family, and to enquire what was become of them. Christ's glory above does not make him forget the concerns of his church below, which he visits in great humility, Mat 17:14. And he came very seasonably, when the disciples were embarrassed and run a-ground; the scribes, who were sworn enemies both to him and them, had gained an advantage against them. A child possessed with a devil was brought to them, and they could not cast out the devil, whereupon the scribes insulted over them, and reflected upon their Master, and triumphed as if the day were their own. He found the scribes questioning with them, in the hearing of the multitude, some of whom perhaps began to be shocked by it. Thus Moses, when he came down from the mount, found the camp of Israel in great disorder; so soon were Christ and Moses missed. Christ's return was very welcome, no doubt, to the disciples, and unwelcome to the scribes. But particular notice is taken of its being very surprising to the people, who perhaps were ready to say, As for this Jesus, we wot not what is become of him; but when they beheld him coming to them again, they were greatly amazed (some copies add, kai exephobēthēsan - and they were afraid); and running to him (some copies for prostrechontes, read proschairontes - congratulating him, or bidding him welcome), they saluted him. It is easy to give a reason why they should be glad to see him; but why where they amazed, greatly amazed, when they beheld him? Probably, there might remain something unusual in his countenance; as Moses's face shone when he came down from the mount, which made the people afraid to come nigh him, Exo 34:30. So perhaps did Christ's face, in some measure; at least, instead of seeming fatigued, there appeared a wonderful briskness and sprightliness in his looks, which amazed them.

II. The case which perplexed the disciples, brought before him. He asked the scribes, who, he knew, were always vexatious to his disciples, and teasing them upon every occasion, "What question ye with them? What is the quarrel now?" The scribes made no answer, for they were confounded at his presence; the disciples made none, for they were comforted, and now left all to him. But the father of the child opened the case, Mar 9:17, Mar 9:18. 1. His child is possessed with a dumb spirit; he has the falling-sickness, and in his fits is speechless; his case is very sad, for, wheresoever the fit takes him, the spirit tears him, throws him into such violent convulsions as almost pull him to pieces; and, which is very grievous to himself, and frightful to those about him, he foams at his mouth, and gnashes with his teeth, as one in pain and great misery; and though the fits go off presently, yet they leave him so weak, that he pines away, is worn to a skeleton; his flesh is dried away; so the word signifies, Psa 102:3-5. This was a constant affliction to a tender father. 2. The disciples cannot give him any relief; "I desired they would cast him out, as they had done many, and they would willingly have done it, but they could not; and therefore thou couldest never have come in better time; Master, I have brought him to thee."

III. The rebuke he gave to them all (Mar 9:19); O faithless generation, how long shall I be with you? How long shall I suffer you? Dr. Hammond understands this as spoken to the disciples, reproving them for not exerting the power he had given them, and because they did not fast and pray, as in some cases he had directed them to do. But Dr. Whitby takes it as a rebuke to the scribes, who gloried in this disappointment that the disciples met with, and hoped to run them down with it. Them he calls a faithless generation, and speaks as one weary of being with them, and of bearing with them. We never heard him complaining, "How long shall I be in this low condition, and suffer that?" But, "How long shall I be among these faithless people, and suffer them?"

IV. The deplorable condition that the child was actually in, when he was brought to Christ, and the doleful representation which the father made of it. When the child saw Christ, he fell into a fit; The spirit straightway tore him, boiled within him, troubled him (so Dr. Hammond); as if the devil would set Christ at defiance, and hoped to be too hard for him too, and to keep possession in spite of him. The child fell on the ground, and wallowed foaming. We may put another construction upon it - that the devil raged, and had so much the greater wrath, because he knew that his time was short, Rev 7:12. Christ asked, How long since this came to him? And, it seems, the disease was of long standing; it came to him of a child (Mar 9:21), which made the case the more sad, and the cure more difficult. We are all by nature children of disobedience, and in such the evil spirit works, and has done so from our childhood; for foolishness is bound in the heart of a child, and nothing but the mighty grace of Christ can cast it out.

V. The pressing instances which the father of the child makes with Christ for a cure (Mar 9:22); Ofttimes it hath cast him into the fire, and into the waters, to destroy him. Note, The devil aims at the ruin of those in whom he rules and works, and seeks whom he may devour. But, if thou canst do any thing, have compassion on us, and help us. The leper was confident of Christ's power, but put an if upon his will (Mat 8:2); If thou wilt, thou canst. This poor man referred himself to his good-will, but put an if upon his power, because his disciples, who cast out devils in his name, had been non-plussed in this case. Thus Christ suffers in his honour by the difficulties and follies of his disciples.

VI. The answer Christ gave to his address (Mar 9:23); If thou canst believe, all things are possible to him that believeth. Here, 1. He tacitly checks the weakness of his faith. The sufferer put it upon Christ's power, If thou canst do any thing, and reflected on the want of power in the disciples; but Christ turns it upon him, and puts him upon questioning his own faith, and will have him impute the disappointment to the want of that; If thou canst believe. 2. He graciously encourages the strength of his desire; "All things are possible, will appear possible, to him that believes the almighty power of God, to which all things are possible;" or "That shall be done by the grace of God, for them that believe in the promise of God, which seemed utterly impossible." Note, In dealing with Christ, very much is put upon our believing, and very much promised it. Canst thou believe? Darest thou believe? Art thou willing to venture thy all in the hands of Christ? To venture all thy spiritual concerns with him, and all thy temporal concerns for him? Canst thou find in thy heart to do this? If so, it is not impossible but that, though thou has been a great sinner, thou mayest be reconciled; though thou art very mean and unworthy, thou mayest get to heaven. If thou canst believe, it is possible that thy hard heart may be softened, thy spiritual diseases may be cured; and that, weak as thou art, thou mayest be able to hold out to the end.

VII. The profession of faith which the poor man made hereupon (Mar 9:24); He cried out, "Lord, I believe; I am fully persuaded both of thy power and of thy pity; my cure shall not be prevented by the want of faith; Lord, I believe." He adds a prayer for grace to enable him more firmly to rely upon the assurances he had of the ability and willingness of Christ to save; Help thou my unbelief. Note, 1. Even those who through grace can say, Lord, I believe, have reason to complain of their unbelief; that they cannot so readily apply to themselves, and their own case, the word of Christ as they should, no so cheerfully depend upon it. 2. Those that complain of unbelief, must look up to Christ for grace to help them against it, and his grace shall be sufficient for them. "Help mine unbelief, help me to a pardon for it, help me with power against it; help out what is wanting in my faith with thy grace, the strength of which is perfected in our weakness."

VIII. The cure of the child, and the conquest of this raging devil in the child. Christ saw the people come running together, expecting to see the issue of this trial of skill, and therefore kept them in suspense no longer, but rebuked the foul spirit; the unclean spirit, so it should be rendered, as in other places. Observe, 1. What the charge was which Christ gave to this unclean spirit; "Thou dumb and deaf spirit, that makest the poor child dumb and deaf, but shalt thyself be made to hear thy doom, and not be able to say any thing against it, come out of him immediately, and enter no more into him. Let him not only be brought out of this fit, but let his fits never return." Note, Whom Christ cures, he cures effectually. Satan may go out himself, and yet recover possession; but if Christ cast him out, he will keep him out. 2. How the unclean spirit took it; he grew yet more outrageous, he cried, and rent him sore, gave him such a twitch at parting, that he was as one dead; so loth was he to quit his hold, so exasperated at the superior power of Christ, so malicious to the child, and so desirous was he to kill him. Many said, He is dead. Thus the toss that a soul is in at the breaking of Satan's power in it may perhaps be frightful for the present, but opens the door to lasting comfort. 3. How the child was perfectly restored (Mar 9:27); Jesus took him by the hand, kratēsas - took fast hold of him, and strongly bore him up, and he arose and recovered, and all was well.

IX. The reason he gave to the disciples why they could not cast out this devil. They enquired of him privately why they could not, that wherein they were defective might be made up another time, and they might not again be thus publicly shamed; and he told them (Mar 9:29), This kind can come forth by nothing but prayer and fasting. Whatever other difference there really might be, none appears between this and other kinds, but that the unclean spirit had had possession of this poor patient from a child, and that strengthened his interest, and confirmed his hold. When vicious habits are rooted by long usage, and begin to plead prescription, like chronical diseases that are hardly cured. Can the Aethiopian change his skin? The disciples must not think to do their work always with a like ease; some services call them to take more than ordinary pains; but Christ can do that with a word's speaking, which they must prevail for the doing of by prayer and fasting.

Matthew Henry (1662–1714) — Commentary on the Whole Bible. This section covers verses 14–29. Public domain.
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Pseudo-Jerome (as quoted by Aquinas, AD 1274)
Catena Aurea by Aquinas
But there is no peace for man under the sun; envy is ever slaying the little ones, and lightnings strike the tops of the great mountains. Of all those who run to the Church, some as the multitudes come in faith to learn, others, as the Scribes, with envy and pride. It goes on, And straightway all the people, when they beheld Jesus, were greatly amazed, and feared.

Now it was the people, and not the disciples, who on seeing Him were amazed and feared, for there is no fear in love; fear belongs to servants, amazement to fools. It goes on: And he asked them, What question ye with them. Why does the Lord put this question? That confession may produce salvation, and the murmuring of our hearts may be appeased by religious words.

This saying, If thou canst, is a proof of the freedom of the will. Again, all things are possible to him that believeth, which evidently means all those things which are prayed for with tears in the name of Jesus, that is, of salvation.

By this also we are taught that our faith is tottering, if it lean not on the stay of the help of God. But faith by its tears receives the accomplishment of its wishes; Wherefore it continues, When Jesus saw that the multitude came running together, he rebuked the foul spirit, saying unto him, Thou dumb and deaf spirit, I charge thee come out of him, and enter no more into him.

Again, a sinner foameth forth folly, gnasheth with anger, pineth away in sloth. But the evil spirit tears him, when coming to salvation, and in like manner those whom he would drag into his maw he tears asunder by terrors and losses, as he did Job.

Further, in his being vexed from his infancy, the Gentile people is signified, from the very birth of whom the vain worship of idols arose, so that they in their folly sacrificed their children to devils. And for this reason it is said that it cast him into the fire and into the water; for some of the Gentiles worshipped fire, others water.

Again, the Lord applies to the evil spirit what he had inflicted on the man, calling him deaf and dumb spirit, because he never will hear and speak what the penitent sinner can speak and hear. But the devil, quitting a man, never returns, if the man keep his heart with the keys of humility and charity, and hold possession of the gate of freedom.1 The man who was healed became as one dead, for it is said to those who are healed, Ye are dead, and your life is hid with Christ in God. (Col. 3:3.)

Or else, the folly which is connected with the softness of the flesh, is healed by fasting; anger and laziness are healed by prayer. Each wound has its own medicine, which must be applied to it; that which is used for the heel will not cure the eye; by fasting, the passions of the body, by prayer, the plagues of the soul, are healed.
TertullianAD 220
On Fasting
Thereafter He prescribed to fasts a law-that they are to be performed "without sadness: " for why should what is salutary be sad? He taught likewise that fasts are to be the weapons for battling with the more direful demons: for what wonder if the same operation is the instrument of the iniquitous spirit's egress as of the Holy Spirit's ingress? Finally, granting that upon the centurion Cornelius, even before baptism, the honourable gift of the Holy Spirit, together with the gift of prophecy besides, had hastened to descend, we see that his fasts had been heard, I think, moreover, that the apostle too, in the Second of Corinthians, among his labours, and perils, and hardships, after "hunger and thirst," enumerates "fasts" also "very many"
Pseudo-ClementAD 400
Two Epistles on Virginity
These things are, without controversy, required of the servants of God, and comely and suitable for them. This also, again, is suitable and right and comely for those who are brethren in Christ, that they should visit those who are harassed by evil spirits, and pray and pronounce adjurations over them, intelligently, offering such prayer as is acceptable before God; not with a multitude of fine words, well prepared and arranged, so that they may appear to men eloquent and of a good memory. Such men are "like a sounding pipe, or a tinkling cymbal;" [1 Corinthians 13:1] and they bring no help to those over whom they make their adjurations; but they speak with terrible words, and affright people, but do not act with true faith, according to the teaching of our Lord, who has said: "This kind goes not out but by fasting and prayer," offered unceasingly and with earnest mind.
John Chrysostom (as quoted by Aquinas, AD 1274)AD 407
Catena Aurea by Aquinas
(ubi sup.) The Scriptures declare that this man was weak in faith, for Christ says, O faithless generation: and He adds, If thou canst believe. But although his want of faith was the cause of their not casting out the devil, he nevertheless accuses the disciples; wherefore it is added, And I spake to thy disciples that they should cast him out; but they could not. Now observe his folly; in praying to Jesus in the midst of the crowd, he accuses the disciples, wherefore the Lord before the multitude so much the more accuses him, and not only aims the accusation at himself, but also extends it to all the Jews; for it is probable that many of those present had been offended, and had held wrong thoughts concerning His disciples. Wherefore there follows, He answereth them and saith, O faithless generation, how long shall I be with you? how long shall I suffer you? By which He showed both that He desired death, and that it was a burden to Him to converse with them.

(ubi sup.) But this the Lord permitted for the sake of the father of the boy, that when he saw the devil vexing his child, he might be brought on to believe that the miracle was to be wrought.

(Vict. Ant. e Cat. in Marc. sed v. Chrys. ubi sup.) His meaning is; such a plenitude of virtue is there in Me, that not only can I do this, but I will make others to have that power; where fore if thou canst believe as thou oughtest to do, thou shalt be able to cure not only him, but many more. In this way then, He endeavoured to bring back to the faith, the man who as yet speaks unfaithfully. There follows, And straightway the father of the child cried out, and said with tears, Lord, I believe; help thou mine unbelief. But if he had already believed, saying, I believe, how is it that he adds, help thou mine unbelief? We must say then that faith is manifold, that one sort of faith is elementary, another perfect; but this man, being but a beginner in believing, prayed the Saviour to add to his virtue what was wanting.

(ubi sup.) They feared that perchance they had lost the grace conferred upon them; for they had already received power over unclean spirits. It goes on: And he said unto them, This kind can come forth by nothing but by prayer and fasting.
JeromeAD 420
Against Jovinianus 2.15
The Lord himself consecrated his baptism by a forty days’ fast, and taught us that the more violent devils cannot be overcome except by prayer and fasting.
Pseudo-Chrysostom (as quoted by Aquinas, AD 1274)AD 500
Catena Aurea by Aquinas
(Vict. Ant. e Cat. in Marc.) Or else, the disciples asked Jesus, how it was written that the Son of man must suffer? Now in answer to this, He says, As John came in the likeness of Elias, and they evil intreated him, so according to the Scriptures must the Son of man suffer.

(Vict. Ant. e Cat. in Marc.) And His rebuking him, and saying, I charge thee, is a proof of Divine power. Again, in that He says not only, come out of him, but also enter no more into him, He shows that the evil spirit was ready to enter again, because the man was weak in faith, but was prevented by the command of the Lord. It goes on, And the spirit cried, and rent him sore, and came out of him; and he was as one dead, insomuch that many said, He is dead. For the devil was not able to inflict death upon him, because the true Life was come.
Gregory the Dialogist (as quoted by Aquinas, AD 1274)AD 604
Catena Aurea by Aquinas
(Mor. x. 30) But he who is freed from the power of the evil spirit is thought to be dead; for whosoever has already subdued earthly desires, puts to death within himself his carnal mode of life, and appears to the world as a dead man, and many look upon him as dead; for they who know not how to live after the Spirit, think that he who does not follow after carnal pleasures is altogether dead.
Bede (as quoted by Aquinas, AD 1274)AD 735
Catena Aurea by Aquinas
(in Marc. 3, 38) In all cases, the difference between the mind of the Scribes and of the people ought to be observed; for the Scribes arc never said to have shown any devotion, faith, humility, and reverence, but as soon as the Lord was come, the whole multitude was greatly amazed and feared, and ran up to Him, and saluted Him; wherefore there follows, And running to him, saluted him.

(ubi sup.) The question, indeed, which was raised may, if I am not deceived, have been this, wherefore they, who were the disciples of the Saviour, were unable to heal the demoniac, who was placed in the midst, which may be gathered from the following words; And one of the multitude answered and said, Master, I have brought unto thee my son, which hath a dumb spirit; and wheresoever he taketh him, he teareth him: and he foameth, and gnasheth with his teeth, and pineth away.

(ubi sup.) So far, however, is He from being angry with the person, though He reproved the sin, that He immediately added, Bring him unto me; and they brought him unto him. And when he saw him, straightway the spirit fare him, and he fell on the ground, and wallowed foaming.

Let Juliang blush, who dares to say that all men are born in the flesh, without the infection of sin, as though they were innocent in all respects, just as Adam was when he was created. For what was there in the boy, that he should be troubled from infancy with a cruel devil, if he were not held at all by the chain of original sin? since it is evident that he could not yet have had any sin of his own.

(ubi sup.) The answer of the Lord was suited to the petition; for the man said, If thou canst do any thing, help us; and to this the Lord answered, If thou canst believe. On the other hand, the leper who cried out, with faith, Lord, if thou will, thou canst make me clean, (Matt. 8:2. 3) received an answer according to his faith, I will, be thou clean.

(ubi sup.) For no man at once reaches to the highest point, but in holy living a man begins with the least things that he may reach the great; for the beginning of virtue is different, from the progress and the perfection of it. Because then faith mounts up through the secret inspiration of grace, by the steps of its own meritsh, he who had not yet believed perfectly was at once a believer and an unbeliever.

(ubi sup.) But him, whom the unholy spirit made like unto death, the holy Saviour saved by the touch of His holy hand; wherefore it goes on, But Jesus took him by the hand, and lifted him up, and he arose. Thus as the Lord had shown Himself to be very God by the power of healing, so He showed that He had the very nature of our flesh, by the manner of His human touch. The Manichæani indeed madly denies that He was truly clothed in flesh; He Himself, however, by raising, cleansing, enlightening so many afflicted persons by His touch, condemned his heresy before its birth. It goes on: And when he was come into the house, his disciples asked him privately, Why could not we cast him out?

(ubi sup.) Again, in a mystical sense, on high the Lord unfolds the mysteries of the kingdom to His disciples, but below He rebukes the multitude for their sins of unfaithfulness, and expels devils from those, who are vexed by them. Those who are still carnal and foolish, He strengthens, teaches, punishes, whilst He more freely instructs the perfect concerning the things of eternity.

(ubi sup.) For oftentimes when we try to turn to God after sin, our old enemy attacks us with new and greater snares, which he does, either to instil into us a hatred of virtue, or to avenge the injury of his expulsion.

(ubi sup.) Or by this demoniac are signified those, who are bound by the guilt of original sin, and coming into the world as criminals, are to be saved by grace; and by fire is meant the heat of anger, by water, the pleasures of the flesh, which melt the soul by their sweetness. But He did not rebuke the boy, who suffered violence, but the devil, who inflicted it, because he who desires to amend a sinner, ought, whilst he exterminates his vice by rebuking and cursing it, to love and cherish the man.

(ubi sup.) Further, our Lord, while teaching the Apostles how the worst devil is to be expelled, gives all of us rules for our life; that is, He would have us know that all the more grievous attacks of evil spirits or of men are to be overcome by fastings and prayers; and again, that the anger of the Lord, when it is kindled for vengeance on our crimes, can be appeased by this remedy alone. But fasting in general is not only abstinence from food, but also from all carnal delights, yea, from all vicious passions. In like manner prayer taken generally, consists not only in the words by which we call upon the Divine mercy, but also in all those things which we do with the devotedness of faith in obedience to our Maker, as the Apostle testifies, when he says, Pray without ceasing. (1 Thess. 5:17)
Theophylact of Ohrid (as quoted by Aquinas, AD 1274)AD 1107
Catena Aurea by Aquinas
After He had shown His glory in the mount to the three disciples, He returns to the other disciples, who had not come up with Him into the mount; wherefore it is said, And when he came to his disciples, he saw a great multitude about them, and the Scribes questioning with them. For the Pharisees, catching the opportunity of the hour when Christ was not present, came up to them, to try to draw them over to themselves.

For the multitude was glad to see Him, so that they saluted Him from afar, as He was coming to them; but some suppose that His countenance had become more beautiful from His transfiguration, and that this induced the crowd to salute Him.

He also permits the child to be vexed, that in this way we might know the devil's wickedness, who would have killed him, had he not been assisted by the Lord. It goes on: And he asked his father, How long is it ago since this came unto him? And he said, Of a child; and offtimes it has cast him into the fire and into the waters to destroy him.

The reason that He rebuked the foul spirit, when He saw the crowd running together, was that he did not wish to cure him before the multitude, that He might give us a lesson to avoid ostentation.

That is, the whole class of lunatics, or simply, of all persons possessed with devils. Both the man to be cured, and he who cures him, should fast; for a real prayer is offered up, when fasting is joined with prayer, when he who prays is sober and not heavy with food.

Again, this devil is deaf and dumb; deaf, because he does not choose to hear the words of God; dumb, because he is unable to teach others their duty.

(ap. Pseudo-Hier.) Again, when Jesus, that is, the word of the Gospel, takes hold of the hand, that is, of our powers of action, then shall we be freed from the devil. And observe that God first helps us, then it is required of us that we do good; for which reason it is said that Jesus raised him, in which is shown the aid of God, and that he arose, in which is declared the zeal of man.
Glossa Ordinaria (as quoted by Aquinas, AD 1274)AD 1274
Catena Aurea by Aquinas
(non occ.) Now he expresses in the words of his petition his want of faith; for that is the reason why he adds, But if thou canst do any thing, have compassion on us, and help us. For in that he says, If thou canst do any thing, he shows that he doubts His power, because he had seen that the disciples of Christ had failed in curing him; but he says, have compassion on us, to show the misery of the son, who suffered, and the father, who suffered with him. It goes on: Jesus said unto him, If thou canst believe, all things are possible to him that believeth.
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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