Passage

Matthew 17

Verses 14–20 WEB Voices

At the foot of the mountain a desperate father kneels for his demon-afflicted son after the disciples failed to heal him. Jesus laments the faithless generation, casts out the demon, and privately explains the failure as little faith—then promises mountain-moving power to mustard-seed faith.

Matthew 17:14

14When they came to the multitude, a man came to him, kneeling down to him and saying,

Arminian

Glory’s hush meets the crowd’s need. A father kneels—posture of plea, not pride.

Grace still draws the desperate to Jesus. Coming and kneeling are fitting responses to mercy offered in Christ.

Reformed

Descent from the mountain lands in human misery. The father’s approach is already under Christ’s lordship.

The King who shone above now faces a crowd He will rule by compassion and authority.

Matthew 17:15

15“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.

Arminian

The cry is simple: “have mercy.” The child’s torment is vivid—fire and water, danger on every side.

Mercy is sincerely sought from Jesus. The gospel still welcomes such prayers; Christ is able and willing to help.

Reformed

Mercy is addressed to the Lord. The father’s words name both affliction and Christ’s sufficiency.

Even incoherent suffering is brought under the Lord’s ear. Prayer’s first grammar is “have mercy.”

Matthew 17:16

16So I brought him to your disciples, and they could not cure him.”

Arminian

Ministry failure is confessed without spin. Disciples who once cast out demons (10:1, 8) here cannot.

Gifts and prior success do not replace present dependence. Grace must be leaned on again; presumption empties power.

Reformed

Inability is reported to Jesus, not hidden. The crisis exposes the disciples’ lack, not the Lord’s.

Instruments fail; the Master does not. This scene will drive them back to faith in Him alone.

Matthew 17:17

17Jesus answered, “Faithless and perverse generation! How long will I be with you? How long will I bear with you? Bring him here to me.”

Arminian

Jesus grieves unbelief—not only the father’s, but a whole generation’s twist. Yet the command is still “Bring him here to me.”

Arminians hear both rebuke and open door: faithlessness is culpable, and Christ still invites approach. Grace enables turning from twisted unbelief to trust.

Reformed

Prophetic lament names the age: faithless and twisted. Patience has a holy weariness; authority still speaks.

Christ bears with a crooked generation according to the Father’s timing—and still claims the boy with “Bring him to me.”

Matthew 17:18

18Jesus rebuked the demon, and it went out of him, and the boy was cured from that hour.

Arminian

A word of rebuke ends what disciples could not. Healing is immediate—mercy without delay.

Jesus’ power meets human helplessness. Faith looks away from failed methods to the Lord who still delivers.

Reformed

Demonic tyranny yields at once to the Son’s rebuke. Instant healing displays sovereign authority.

Evil spirits are not peers of Christ. He frees whom He wills, and the boy’s restoration glorifies Him.

Matthew 17:19

19Then the disciples came to Jesus privately, and said, “Why weren’t we able to cast it out?”

Arminian

Private honesty is healthier than public excuses. They want diagnosis, not spin.

Grace makes room for humble questions after failure. Learning faith is part of following Jesus.

Reformed

They seek the cause from Christ Himself. Failure becomes a classroom under His word.

The Lord answers why. Dependence is taught through collapse of self-reliance.

Matthew 17:20

20He said to them, “Because of your unbelief. For most certainly I tell you, if you have faith as a grain of mustard seed, you will tell this mountain, ‘Move from here to there,’ and it will move; and nothing will be impossible for you.

Arminian

The diagnosis is little faith—not zero calling, but thin trust. Mustard-seed faith is small yet living, fixed on God’s power.

Jesus does not demand giant self-confidence. Grace enables free trust; even small faith, exercised, joins God’s mountain-moving work. Unbelief remains the tragedy to repent of.

Reformed

Little faith explains the failure. Mountain language is hyperbole for God-sized impossibility yielding to trusting prayer.

Faith’s potency is not in its bulk but in its object. God does the moving; mustard-seed trust clings to Him. Nothing promised in His will is impossible to those who believe.

Key contrast Both refuse faithless ministry and boastful self-trust. Arminians underline grace-enabled, responsible exercise of even small faith; Reformed commentators emphasize that mountain-moving power rests in God, to whom true (even tiny) faith looks.

Historic quotes

Voices from both camps

Classic Arminian and Reformed comment on Matthew 17:14–20, in the writers’ own words.

Arminian Notable voices

“He is lunatic - This word might with great propriety he used, though the case was mostly preternatural; as the evil spirit would undoubtedly take advantage of the influence which the changes of the moon have on the brain and nerves. O unbelieving and perverse generation - Our Lord speaks principally this to his disciples.”
John Wesley · Explanatory Notes upon the New Testament (on Matt 17:14–20)

Reformed Notable voices

“Though Christ appears to direct his discourse to the father of the lunatic, yet there can be no doubt that he refers to the scribes, as I have lately explained; for it is certain that the reproof is directed, not against ignorant and weak persons, but against those who, through inveterate malice, obstinately resist God. This is the reason why Christ declares that they are no longer worthy to be endured, and threatens that ere long he will separate from them.”
John Calvin · Commentary on a Harmony of the Evangelists (on Matt 17:14–20)

Quotations lightly abridged for length; wording follows standard English translations of the sources named.

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