John Chrysostom — as excerpted in the Catena Aurea on John 9:35-41

“(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.”