14 When they came to the multitude, a man came to him, kneeling down to him, saying, 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. 16 So I brought him to your disciples, and they could not cure him.” 17 Jesus answered, “Faithless and perverse generation! How long will I be with you? How long will I bear with you? Bring him here to me.” 18 Jesus rebuked him, the demon went out of him, and the boy was cured from that hour. 19 Then the disciples came to Jesus privately, and said, “Why weren’t we able to cast it out?” 20 He 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.
Matthew Henry's Commentary on Matthew 17:14-20
Commentary on Matthew 17:14-21
(Read Matthew 17:14-21)
The case of afflicted children should be presented to God by faithful and fervent prayer. Christ cured the child. Though the people were perverse, and Christ was provoked, yet care was taken of the child. When all other helps and succours fail, we are welcome to Christ, may trust in him, and in his power and goodness. See here an emblem of Christ's undertaking as our Redeemer. It encourages parents to bring children to Christ, whose souls are under Satan's power; he is able to heal them, and as willing as he is able. Not only bring them to Christ by prayer, but bring them to the word of Christ; to means by which Satan's strong-holds in the soul are beaten down. It is good for us to distrust ourselves and our own strength; but it is displeasing to Christ when we distrust any power derived from him, or granted by him. There was also something in the malady which rendered the cure difficult. The extraordinary power of Satan must not discourage our faith, but quicken us to more earnestness in praying to God for the increase of it. Do we wonder to see Satan's bodily possession of this young man from a child, when we see his spiritual possession of every son of Adam from the fall!