Mark 2:5

(non occ.) Further, He first healed by the remission of sins that which He had come to seek, that is, a soul, so that when they faithlessly doubted, then He might bring forward a work before them, and in this way His word might be confirmed by the work, and a hidden sign be proved by an open one, that is, the health of the soul by the healing of the body.

There follows: But when Jesus saw their faith, he said to the sick of the palsy, Son, thy sins be forgiven thee. He did not mean the faith of the sick man, but of his bearers; for it sometimes happens, that a man is healed by the faith of another.

(ubi sup.) It may indeed be seen, how much each person's own faith weighs with God, when that of another had such influence that the whole man at once rose up, healed body and soul, and by one man's merit, another should have his sins forgiven him.

(ubi sup.) Moreover, the Lord being about to cure the man of the palsy, first loosed the chains of his sins, in order to show that he was condemned to the loosening of his joints, because of the bonds of his sins, and could not be healed to the recovery of his limbs, unless these were first loosened. But Christ's wonderful humility calls this man, despised, weak, with all the joints of his limbs unstrung, a son, when the priests did not deign to touch him. Or at least, He therefore calls him a son, because his sins are forgiven him. It goes on: But there were certain of the scribes sitting there, and reasoning in their hearts, Why doth this man speak blasphemies?

He saw the faith of the sick man himself, since he would not have allowed himself to be carried, unless he had had faith to be healed.