Mark 9:20

(ubi sup.) But this the Lord permitted for the sake of the father of the boy, that when he saw the devil vexing his child, he might be brought on to believe that the miracle was to be wrought.

He also permits the child to be vexed, that in this way we might know the devil's wickedness, who would have killed him, had he not been assisted by the Lord. It goes on: And he asked his father, How long is it ago since this came unto him? And he said, Of a child; and offtimes it has cast him into the fire and into the waters to destroy him.

(ubi sup.) So far, however, is He from being angry with the person, though He reproved the sin, that He immediately added, Bring him unto me; and they brought him unto him. And when he saw him, straightway the spirit fare him, and he fell on the ground, and wallowed foaming.

This saying, If thou canst, is a proof of the freedom of the will. Again, all things are possible to him that believeth, which evidently means all those things which are prayed for with tears in the name of Jesus, that is, of salvation. By this also we are taught that our faith is tottering, if it lean not on the stay of the help of God. But faith by its tears receives the accomplishment of its wishes; Wherefore it continues, When Jesus saw that the multitude came running together, he rebuked the foul spirit, saying unto him, Thou dumb and deaf spirit, I charge thee come out of him, and enter no more into him. Again, a sinner foameth forth folly, gnasheth with anger, pineth away in sloth. But the evil spirit tears him, when coming to salvation, and in like manner those whom he would drag into his maw he tears asunder by terrors and losses, as he did Job. Further, in his being vexed from his infancy, the Gentile people is signified, from the very birth of whom the vain worship of idols arose, so that they in their folly sacrificed their children to devils. And for this reason it is said that it cast him into the fire and into the water; for some of the Gentiles worshipped fire, others water. Again, the Lord applies to the evil spirit what he had inflicted on the man, calling him deaf and dumb spirit, because he never will hear and speak what the penitent sinner can speak and hear. But the devil, quitting a man, never returns, if the man keep his heart with the keys of humility and charity, and hold possession of the gate of freedom.1 The man who was healed became as one dead, for it is said to those who are healed, Ye are dead, and your life is hid with Christ in God. (Col. 3:3.)