Origen
Catena Aurea · Matthäusevangelium 17
And when they were come to the multitude, there came to him a certain man, kneeling down to him, and saying, Lord, have mercy on my son: for he is lunatick, and sore vexed: for ofttimes he falleth into the fire, and oft into the water. And I brought him to thy disciples, and they could not cure him. Then Jesus answered and said, O faithless and perverse generation, how long shall I be with you? how long shall I suffer you? bring him hither to me. And Jesus rebuked the devil; and he departed out of him: and the child was cured from that very hour.
Of the changefulness of the sinner it is said, The fool changes as the moon. (Ecclus. 27:12.) We may see sometimes that an impulse towards good works comes over such, when, lo! again as by a sudden seizure of a spirit they are laid hold of by their passions, and fall from that good state in which they were supposed to stand. Perhaps his father stands for the Angel to whom was allotted the care of this lunatic, praying the Physician of souls, that He would set free his son, who could not be delivered from his sufferingby the simple word of Christ’s disciples, because as a deaf person he cannot receive their instruction, and therefore he needs Christ’s word, that henceforth he may not act without reason.