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“Jesus Heals a Demoniac Boy”· Mark 9:14–29
Translation
King James Version
And straightway the father of the child cried out, and said with tears, Lord, I believe; help thou mine unbelief.
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KJV (with Strong's)
And G2532 straightway G2112 the father G3962 of the child G3813 cried out G2896, and said G3004 with G3326 tears G1144, Lord G2962, I believe G4100; help thou G997 mine G3450 unbelief G570.
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Complete Jewish Bible
Instantly the father of the child exclaimed, "I do trust -- help my lack of trust!"
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Berean Standard Bible
Immediately the boy’s father cried out, “I do believe; help my unbelief!”
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American Standard Version
Straightway the father of the child cried out, and said, I believe; help thou mine unbelief.
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World English Bible Messianic
Immediately the father of the child cried out with tears, “I believe. Help my unbelief!”
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Geneva Bible (1599)
And straightway the father of the childe crying with teares, saide, Lord, I beleeue: helpe my vnbeliefe.
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Young's Literal Translation
and immediately the father of the child, having cried out, with tears said, `I believe, sir; be helping mine unbelief.'
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Study This Verse

Summary

Mark 9:24 captures a raw and profoundly human moment as a desperate father, seeking healing for his demon-possessed son, cries out to Jesus with a paradoxical plea: "Lord, I believe; help thou mine unbelief." This verse encapsulates the tension between intellectual assent and the lived reality of doubt, revealing a sincere heart that acknowledges both its faith and its inherent spiritual struggle, appealing directly to Christ's power and compassion for the grace to overcome its limitations.

Context

Literary Context

This poignant declaration occurs immediately after Jesus' descent from the Mount of Transfiguration with Peter, James, and John. Upon their return, they find the remaining disciples engaged in a futile attempt to cast out a mute and deaf spirit from a young boy. The scribes are disputing with the disciples, highlighting their inability and the spiritual impotence of the religious leaders. The father, having already brought his son to the disciples without success (Mark 9:17-18), expresses his profound despair and doubt to Jesus, stating, "If thou canst do any thing, have compassion on us, and help us" (Mark 9:22). Jesus' response, "If thou canst believe, all things are possible to him that believeth" (Mark 9:23), directly challenges the father's "if," shifting the focus from Jesus' ability to the father's faith. It is in direct response to this profound statement that the father utters his honest and tearful confession, setting the stage for Jesus' powerful demonstration of authority over the demonic realm.

Historical & Cultural Context

In first-century Judea, illnesses and afflictions that defied natural explanation were often attributed to demonic possession. Such conditions brought immense suffering not only to the afflicted individual but also to their families, often leading to social ostracization and economic hardship. There was a widespread belief in the power of spiritual healers and exorcists, but their efficacy varied greatly. The Jewish people, living under Roman occupation, also harbored Messianic expectations, anticipating a deliverer who would demonstrate divine power, including the ability to cast out demons and heal the sick. The father's desperate search for help, moving from the disciples to Jesus Himself, reflects the common practice of seeking out those believed to possess divine authority or spiritual power to alleviate suffering. His plea is rooted in a cultural understanding of spiritual warfare and the profound need for divine intervention in the face of overwhelming evil.

Key Themes

Mark 9:24 contributes significantly to several key themes within the Gospel of Mark. Firstly, it underscores the nature of faith as not merely intellectual assent but a dynamic, often struggling, reliance on God's power. The father's cry reveals that true faith can coexist with doubt, and that honesty about one's spiritual weakness is a pathway to divine help. Secondly, it highlights the supreme authority and power of Jesus over all evil, contrasting sharply with the disciples' limitations. While they failed, Jesus' immediate and effective intervention demonstrates His unique divine prerogative to conquer spiritual darkness. Thirdly, the passage emphasizes Jesus' compassion for those who are suffering and struggling, even when their faith is imperfect. He does not rebuke the father for his mixed faith but responds to his desperate plea. Finally, it subtly points to the cost of discipleship and the need for prayer and fasting (Mark 9:29) for effective ministry, suggesting that spiritual power is not automatic but requires a deeper reliance on God.

Exposition and Analysis

Key Word Analysis

cried out krázō' G2896

This word means "to croak" or "scream," implying a loud, often desperate or urgent call. It suggests a visceral, guttural sound born of deep emotion—in this context, anguish, desperation, and a fervent plea. It's not a calm statement but an outburst, reflecting the father's profound distress and the intensity of his appeal to Jesus.

tears dákry' G1144

This noun refers to a tear, a drop of liquid shed from the eyes as a sign of emotion. The presence of tears emphasizes the father's profound sorrow, desperation, and the emotional weight of his plea. It signifies his vulnerability and the depth of his suffering over his son's condition, making his confession of faith and unbelief all the more poignant and authentic.

unbelief apistía' G570

This term denotes "faithlessness" or "disbelief," specifically a lack of Christian faith or unfaithfulness/disobedience. In this context, it points not to an active rejection of God or Christ, but rather to an insufficiency or deficiency of faith. The father desires to believe fully but acknowledges his present inability to grasp the full extent of "all things are possible to him that believeth," revealing a struggle within his own heart rather than outright rejection.

Verse Breakdown

"And straightway the father of the child cried out,"

The adverb "straightway" (Greek: euthéōs) indicates an immediate, spontaneous reaction from the father, underscoring the urgency and emotional intensity of the moment. His "cried out" (Greek: krázō) signifies a loud, impassioned, almost desperate cry, born from profound anguish and a desperate hope that Jesus might be the answer to his long suffering.

"and said with tears,"

The addition of "with tears" emphasizes the father's deep emotional distress and vulnerability. These are not tears of sorrow alone, but likely a mixture of despair over his son's condition, the frustration of the disciples' failure, and a glimmer of hope mixed with doubt in the presence of Jesus. His words are not merely intellectual but are saturated with raw emotion.

"Lord, I believe;"

This is the first part of the father's paradoxical confession. The address "Lord" (Greek: kýrios) acknowledges Jesus' authority and power, indicating a recognition of His divine nature or at least His exceptional status. The declaration "I believe" (Greek: pisteúō) signifies an assent to Jesus' power and an intellectual acceptance of the possibility of healing. It is a genuine, albeit incomplete, statement of faith.

"help thou mine unbelief."

This is the profound counterpoint to his declaration of belief. The father honestly admits his struggle with doubt and his inability to fully embrace the truth of "all things are possible." He doesn't ask for more evidence, but for divine intervention to strengthen his deficient faith. This plea for "help" (Greek: boēthéō) in his "unbelief" (Greek: apistía) reveals a humble recognition that faith itself is a gift and that spiritual weakness can be overcome only through God's grace.

Literary Devices

The verse is rich in Pathos, evoking deep sympathy for the father's desperate plight, highlighted by his "tears" and "cried out." The central literary device is Paradox, as the father simultaneously declares "I believe" and "help thou mine unbelief." This seemingly contradictory statement powerfully illustrates the complex reality of human faith, which often coexists with doubt and struggle. It is an Honest Confession and a direct Supplication, where the father lays bare his spiritual vulnerability before Jesus, appealing for divine grace to bridge the gap between his desire to believe and his present inability to do so fully. The brevity and directness of the plea also contribute to its dramatic impact, making it a memorable and relatable moment in the narrative.

Theological and Thematic Connections

Mark 9:24 offers a profound theological insight into the nature of faith itself. It challenges the simplistic notion that faith must be perfect or absolute to be effective. Instead, it portrays faith as a dynamic process, often mingled with doubt, and yet still acceptable to God. The father's cry demonstrates that true faith is not about the strength of human conviction, but about the object of that faith – Jesus Christ. His willingness to express his weakness and appeal for divine assistance highlights that faith, even in its nascent or struggling form, is a gift from God and is perfected by Him. This passage powerfully illustrates God's compassion for the struggling believer, affirming that He meets us in our weakness and responds to genuine cries for help, even when our faith is imperfect. It underscores that spiritual power flows from God's grace, not from human merit or flawless belief.

Reflection and Application

Mark 9:24 offers immense comfort and profound practical lessons for every believer. It validates the universal human experience of doubt and spiritual struggle, reminding us that faith is rarely a static, unblemished state. The father's courageous honesty in admitting his "unbelief" alongside his "I believe" gives us permission to be transparent with God about our own spiritual uncertainties, fears, and areas of weakness. We do not need to pretend to have perfect faith to approach Him or to experience His power. God is not intimidated by our doubts; in fact, He invites us to bring them to Him, for He is the one who strengthens and perfects our faith. This verse teaches us that true reliance is not on the amount of our faith, but on the object of our faith – the all-powerful and compassionate Lord Jesus. It encourages us to persist in prayer, even when our hearts are conflicted, trusting that God hears and responds to a sincere cry for help, meeting us precisely where we are in our journey of faith.

Questions for Reflection

  1. In what areas of your life do you feel a tension between "I believe" and "help thou mine unbelief"?
  2. How does the father's honesty in this verse encourage you to be more transparent with God about your own doubts or struggles?
  3. What does this passage teach you about God's compassion for those who are struggling with their faith?
  4. How can you actively pray for God to "help your unbelief" in specific situations today?

FAQ

Can someone truly believe and disbelieve at the same time?

Yes, the father's cry in Mark 9:24 illustrates that faith is often a complex and dynamic state, not a simple on/off switch. His statement "Lord, I believe; help thou mine unbelief" reveals a genuine desire to believe and an intellectual assent to Jesus' power, coexisting with an emotional or experiential struggle with doubt, fear, or a lack of full conviction. This is not a contradiction in terms of hypocrisy, but a raw, honest admission of the human condition. It signifies a faith that is real but imperfect, a seed of belief that is struggling to grow amidst the weeds of uncertainty. God, in His compassion, honors this honesty and meets us in our struggle, perfecting what is lacking.

Does this verse mean that my doubts are acceptable to God?

Absolutely. This verse provides immense comfort by showing that God is not put off by our doubts or imperfect faith. The father's tears and honest confession were met with compassion and action from Jesus, not condemnation. While the Bible calls us to grow in faith and overcome doubt (James 1:6-8), it also acknowledges the reality of human weakness. This passage teaches us that it's not the absence of doubt that God desires, but our willingness to bring our doubts to Him, to acknowledge them, and to ask for His help in strengthening our belief. It is in our weakness that His strength is made perfect (2 Corinthians 12:9).

Christ-Centered Fulfillment

Mark 9:24 finds its ultimate fulfillment in the person and work of Jesus Christ, who is not only the object of our faith but also its very source and perfecter. The father's desperate plea for help with his unbelief points directly to Christ as the one who alone can supply what is lacking in human faith. Jesus, as the compassionate Son of God, does not rebuke the father's mixed faith but responds to his honest vulnerability, demonstrating that His power is not contingent upon the perfection of human belief, but upon His own divine authority and grace. He is the one who casts out the demon where the disciples failed, proving that He is indeed "the author and finisher of our faith" (Hebrews 12:2). Furthermore, Jesus' willingness to meet the father in his weakness foreshadows His role as our High Priest, who "can have compassion on the ignorant, and on them that are out of the way" (Hebrews 5:2). In Christ, our "unbelief" is not a barrier to God's help, but an invitation for His transformative grace to make us whole, for He came "to seek and to save that which was lost" (Luke 19:10). He is the answer to every cry for help, the one who perfects our faith and overcomes all spiritual darkness.

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Public-domain commentary

Matthew Henry

From his Commentary on the Whole Bible. Henry comments on passages, not single verses — this entry covers Mark 9:14–29. His two-level outline is real structure in the source text, so it is rendered as structure.

1662–1714 · 16 verses
Passage under commentMark 9:14–29
I. II. Main points1. 2. Sub-points

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.

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Historical interpretation

Sixteen Centuries of Reception

13 surviving comments on this verse. Each one is dated, so this reads as a timeline rather than a list.

13 quotes · AD 407–1973
Ante-NicenePost-NiceneEarly MedievalMedieval
40050060070080090010001100120013001400150016001700180019002000

Select a marker to jump to its quote. Markers stagger vertically where authors wrote within a few decades of each other.

Pseudo-Jeromeas quoted by Aquinas, AD 1274SourceCatena 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.
AD 407John Chrysostomas quoted by Aquinas, AD 1274Post-NiceneSourceCatena 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.
Where faith fails, prayer perishes. For who prays for that in which he does not believe?… So then in order that we may pray, let us believe, and let us pray that this same faith by which we pray may not falter.
In saying, “When the Son of Man shall come, shall he find faith upon the earth?” our Lord spoke of that faith which is fully matured, which is so seldom found on earth. The church’s faith is full, for who would come here if there were no fullness of faith? And whose faith when fully matured would not move mountains? Look at the apostles themselves, who would not have left all they had, trodden under foot this world’s hope, and followed the Lord, if they had not had proportionally great faith. And yet if they had already experienced a completely matured faith, they would have not said to the Lord, “Increase our faith.” Rather we find here an emerging faith, which is not yet full faith, in that father who when he had presented to the Lord his son to be cured of an evil spirit and was asked whether he believed, answered, “Lord, I believe, help me in my unbelief.” “Lord,” says he, “I believe.” “I believe”: therefore there was faith; but “help me in my unbelief”: therefore there was not full faith.
AD 435John CassianPost-NiceneSourceCONFERENCE OF ABBOT PAPHNUTIUS 16
Seeing that his faith was being driven by the waves of unbelief on the rocks which would cause a fearful shipwreck, he asks of the Lord an aid to his faith, saying “Lord, help me in my unbelief.” So thoroughly did the apostles and those who live in the gospel realize that everything which is good is brought to completion by the aid of the Lord, and not imagine that they could preserve their faith unharmed by their own strength or free will, that they prayed that it might be helped and granted to them by the Lord.
AD 500Pseudo-Chrysostomas quoted by Aquinas, AD 1274Post-NiceneSourceCatena 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.
AD 542Caesarius of ArlesPost-NiceneSourceSERMONS 12
So great is the virtue of faith that even those who refuse to keep it still presume to praise it. Truly deservedly is faith extolled, for without it no good work is ever begun or completed.
AD 604Gregory the Dialogistas quoted by Aquinas, AD 1274Early MedievalSourceCatena 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.
AD 735Bedeas quoted by Aquinas, AD 1274Early MedievalSourceCatena 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)
AD 735BedeEarly MedievalSourceOn the Gospel of Mark
And immediately the father of the child cried out with tears, saying: I believe, Lord; help my unbelief. No one becomes supreme suddenly: but in good conduct, everyone begins from the smallest things, so as to reach the great. For the beginnings of virtue are one thing, progress another, and perfection yet another. For if faith itself were not led to its perfection by certain stages, this one, when asked if he believed, would not answer: I believe, Lord; help my unbelief. For if he believed, why did he speak of unbelief? And if he knew he had unbelief, how did he believe? But because faith grows through the hidden inspiration of grace by the steps of one's merits, at one and the same time the one who did not yet believe perfectly both believed and was unbelieving.
AD 1107Theophylact of Ohridas quoted by Aquinas, AD 1274MedievalSourceCatena 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.
AD 1274Glossa Ordinariaas quoted by Aquinas, AD 1274MedievalSourceCatena 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.
AD 1973JRR TolkienMedievalSourceLetter #250, The Letters of J.R.R. Tolkien, To Michael Tolkien 1963
You speak of 'sagging faith', however. That is quite another matter: In the last resort faith is an act of will, inspired by love. Our love may be chilled and our will eroded by the spectacle of the shortcomings, folly, and even sins of the Church and its ministers, but I do not think that one who has once had faith goes back over the line for these reasons (least of all anyone with any historical knowledge). 'Scandal' at most is an occasion of temptation – as indecency is to lust, which it does not make but arouses. It is convenient because it tends to turn our eyes away from ourselves and our own faults to find a scape-goat. But the act of will of faith is not a single moment of final decision : it is a permanent indefinitely repeated act > state which must go on – so we pray for 'final perseverance'. The temptation to 'unbelief (which really means rejection of Our Lord and His claims) is always there within us. Pan of us longs to find an excuse for it outside us. The stronger the inner temptation the more readily and severely shall we be 'scandalized' by others. I think I am as sensitive as you (or any other Christian) to the 'scandals', both of clergy and laity. I have suffered grievously in my life from stupid, tired, dimmed, and even bad priests; but I now know enough about myself to be aware that I should not leave the Church (which for me would mean leaving the allegiance of Our Lord) for any such reasons: I should leave because I did not believe, and should not believe any more, even if I had never met any one in orders who was not both wise and saintly...

The only cure for sagging of fainting faith is Communion. Though always Itself, perfect and complete and inviolate, the Blessed Sacrament does not operate completely and once for all in any of us. Like the act of Faith it must be continuous and grow by exercise. Frequency is of the highest effect. Seven times a week is more nourishing than seven times at intervals. Also I can recommend this as an exercise (alas! only too easy to find opportunity for): make your communion in circumstances that affront your taste. Choose a snuffling or gabbling priest or a proud and vulgar friar; and a church full of the usual bourgeois crowd, ill-behaved children – from those who yell to those products of Catholic schools who the moment the tabernacle is opened sit back and yawn – open necked and dirty youths, women in trousers and often with hair both unkempt and uncovered. Go to Communion with them (and pray for them). It will be just the same (or better than that) as a mass said beautifully by a visibly holy man, and shared by a few devout and decorous people. (It could not be worse than the mess of the feeding of the Five Thousand – after which [Our] Lord propounded the feeding that was to come.)
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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