He hearkened to the voice, and with joy he said: "And who is He, O Lord, that I might believe in Him?" Why did He ask "Do you believe" of him? "Do you believe in the Son of God?" I see that Your word is truth. However, if you give me the knowledge, I will not neglect to believe You. "And who is He, O Lord, that I might believe in Him?" And the Foreseer was before him. And he looked upon Him, Who spoke to you previously. He Who was with you within the council, and outside speaks with you. "Do you believe in the Son of God?" He who was enlightened in body and in mind said: "And who is He, O Lord, that I might believe in Him?" He replied to him: "You have seen Him, and it is He Who is speaking to you." He, therefore, said: "I believe, O Lord," And he worshiped Him
I said these things, that all of you might learn, and that I might call all to fall before the teacher, and to imitate the Good Shepherd, and to struggle on behalf of the Truth...
Excerpt from St. John Chrysostom's homily: "On zeal and piety, and on the man born blind".