John 9:36

(Hom. lix. 1) But the blind man did not yet know Christ, for before he went to Christ he was blind, and after his cure, he was taken hold of by the Jews: He answered and said, Who is He, Lord, that I might believe on Him? The speech this of a longing and enquiring mind. He knows not who He is for whom he had contended so much; a proof to thee of his love of truth. The Lord however says not to him, I am He who healed thee; but uses a middle way of speaking, Thou hast both seen Him.

When they had cast him out from the Temple, Jesus found him. The Evangelist shows, that He came for the purpose of meeting him. And observe how He recompenseth him, by that which is the chiefest of blessings. For He made Himself known to him who before knew Him not, and enrolled him into the company of His own disciples. Observe also how the Evangelist describes the exact circumstances; for when Christ had said, "Dost thou believe on the Son of God?" the man replied, "Lord, who is He?" For as yet he knew Him not, although he had been healed; because he was blind before he came to his Benefactor, and after the cure, he was being worried by those dogs. Therefore, like some judge at the games, He receiveth the champion who had toiled much and gained the crown. And what saith He? "Dost thou believe on the Son of God?" What is this, after so much arguing against the Jews, after so many words, He asketh him, "Dost thou believe?" He spake it not from ignorance, but desiring to make Himself known, and showing that He gently valued the man's faith. "This great multitude," He saith, "hath insulted Me, but of them I make no account; for one thing I care, that thou shouldest believe. For better is one who doeth the will of God, than ten thousand transgressors." "Dost thou believe on the Son of God?" As having both been present, and as approving what had been said by him, He asketh this question; and first, He brought him to a state of longing for Himself. For He said not directly, "Believe," but in the way of an enquiry. What then said the man? "Lord, who is He, that I might believe on Him?" The expression is that of a longing and enquiring soul. He knoweth not Him in whose defense he had spoken so much, that thou mayest learn his love of truth. For he had not yet seen Him.