John Chrysostom
He spat indeed, and put His hand upon the blind man, because He wished to shew 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 shewing 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.
From the commencement, however, of the return of his senses, He leads him to apprehend things by faith, and thus makes him see perfectly; wherefore it goes on, After that, he put his hands again upon his eyes, and he began to see, and afterwards he adds, And he was restored, and saw all things clearly; that is, being perfectly healed in his senses and his intellect. It goes on: And he sent him away to his house, saying, Go into thy home, and if thou enter into the town, tell it not to any one.