15 Lord have mercy on my son: for he is off his head, and is in great pain; and frequently he goes falling into the fire, and frequently into the water. 16 And I took him to your disciples, and they were not able to make him well. 17 And Jesus, answering, said, O false and foolish generation, how long will I be with you? how long will I put up with you? let him come here to me. 18 And Jesus gave orders to the unclean spirit, and it went out of him: and the boy was made well from that hour.
Matthew Henry's Commentary on Matthew 17:15-18
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!