Mark 1:40

(de Con. Evan. ii. 19) Mark puts together circumstances, from which one may infer that he is the same as that one whom Matthew (Matt. 8:2) relates to have been cleansed, when the Lord came down from the mount, after the sermon.

(in Marc. i. 7) After that the serpent-tongue of the devils was shut up, and the woman, who was first seduced, cured of a fever, in the third place, the man, who listened to the evil counsels of the woman, is cleansed from his leprosy, that the order of restoration in the Lord might be the same as was the order of the fall in our first parents; whence it goes on: And there came a leper to him, beseeching him.

(in Marc. i. 9) And because the Lord said that He came not to destroy the Law but to fulfill, (Matt. 5:17) he who was excluded by the Law, inferring that he was cleansed by the power of the Lord, showed that that grace, which could wash away the stain of the leper, was not from the Law, but over the Law. And truly, as in the Lord authoritative power, so in him the constancy of faith is shewn; for there follows, Lord, if thou wilt, thou canst make me clean. He falls on his face, which is at once a gesture of lowliness and of shame, to show that every man should blush for the stains of his life. But his shame did not stifle confession; he showed his wound, and begged for medicine, and the confession is full of devotion and of faith, for he refers the power to the will of the Lord.

For he said not, If thou wilt, pray unto God, but, If thou wilt, as thinking Him very God.

Mystically, our leprosy is the sin of the first man, which began from the head, when he desired the kingdoms of the world. For covetousness is the root of all evil; wherefore Gehazi, engaged in an avaritious pursuit, is covered with leprosy. This leprosy is cleansed on offering an oblation to the true Priest after the order of Melchisedec; for He tells us, Give alms of such things as ye have, and, behold, all things are clean unto you. (Luke 11:41)