Mark 8:23

(Vict. Ant. e Cat. in Marc.) He spat indeed, and put His hand upon the blind man, because He wished to show that wonderful are the effects of the Divine word added to action; for the hand is the symbol of working, but the spittle, of the word proceeding out of the mouth. Again He asked him whether he could see any thing, which He had not done in the case of any whom He had healed, thus showing that by the weak faith of those who brought him, and of the blind man himself, his eyes could not altogether be opened. Wherefore there follows: And he looked up, and said, I see men as trees walking; because he was still under the influence of unfaithfulness, he said that he saw men obscurely.

(in Marc. 2, 34) Knowing that the touch of the Lord could give sight to a blind man as well as cleanse a leper. It goes on, And he took the blind man by the hand, and led him out of the town.

(ubi sup.) For the Lord touches us, when He enlightens our minds with the breath of His Spirit, and He stirs us up that we may recognise our own infirmity, and be diligent in good actions. He takes the hand of the blind man, that He may strengthen him to the practice of good works.

(ubi sup.) Or else, putting spittle into the eyes of the blind man, he lays His hands upon him that he may see, because He has wiped away the blindness of the human race both by invisible gifts, and by the Sacrament of His assumed humanity; for the spittle, proceeding from the Head, points out the grace of the Holy Ghost. But though by one word He could cure the man wholly and all at once, still He cures him by degrees, that He may show the greatness of the blindness of man, which can hardly, and only as it were step by step, be restored to light; and He exhibits to us His grace, by which He furthers each step towards perfection. Again, whoever is weighed down by a blindness of such long continuance, that he is unable to distinguish between good and evil, sees as it were men like trees walking, because he sees the deeds of the multitude without the light of discretion.

And He brings him out of the town, that is, out of the neighbourhood of the wicked; and He puts spittle into his eyes, that he may see the will of God, by the breath of the Holy Ghost; and putting His hands upon him, He asked him if he could see, because by the works of the Lord His majesty is seen.