Mark 9:24

(ubi sup.) For no man at once reaches to the highest point, but in holy living a man begins with the least things that he may reach the great; for the beginning of virtue is different, from the progress and the perfection of it. Because then faith mounts up through the secret inspiration of grace, by the steps of its own meritsh, he who had not yet believed perfectly was at once a believer and an unbeliever.

(Vict. Ant. e Cat. in Marc. sed v. Chrys. ubi sup.) His meaning is; such a plenitude of virtue is there in Me, that not only can I do this, but I will make others to have that power; where fore if thou canst believe as thou oughtest to do, thou shalt be able to cure not only him, but many more. In this way then, He endeavoured to bring back to the faith, the man who as yet speaks unfaithfully. There follows, And straightway the father of the child cried out, and said with tears, Lord, I believe; help thou mine unbelief. But if he had already believed, saying, I believe, how is it that he adds, help thou mine unbelief? We must say then that faith is manifold, that one sort of faith is elementary, another perfect; but this man, being but a beginner in believing, prayed the Saviour to add to his virtue what was wanting.

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.)