Luke 9:37

The event described in these verses took place immediately after the transfiguration. The Lord Jesus, we should remark, did not tarry long on the Mount of Olives. His communion with Moses and Elijah was very short. He soon returned to His usual work of doing good to a sin-stricken world . In His life on earth, to receive honor and have visions of glory — was the exception. To minister to others, to heal all who were oppressed by the devil, to do acts of mercy to sinners — was the rule. Happy are those Christians who have learned of Jesus, to live for others more than for themselves; and who understand that it is "more blessed to give, than to receive." (Acts 20:35.) We have first, in these verses — an example of what a parent should do when he is troubled about his children. We are told of a man in severe distress about his only son. This son was possessed by an evil spirit, and grievously tormented by him, both in body and soul. In his distress, the father makes application to our Lord Jesus Christ for relief. "Master," he says, "I beseech You, look upon my son — for he is my only child." There are many Christian fathers and mothers at this day who are just as miserable about their children as the man of whom we are reading. The son who was once the "desire of their eyes," and in whom their lives were bound up — turns out to be a thief, a profligate, and a companion of sinners. The daughter who was once the flower of the family, and of whom they said, "This girl shall be the comfort of our old age!" — becomes self-willed, worldly minded, and a lover of pleasure more than a lover of God. Their hearts are well near broken. The iron seems to enter into their souls. The devil appears to triumph over them, and rob them of their choicest jewels. They are ready to cry, "I shall go sorrowing to the grave. What good shall my life do to me?"

See this passage explained in the Mat 17:14-21 notes, and Mark 9:14-29 notes.