“His parents answered them and said, We know that this is our son, and that he was born blind:”
John 9:20 — Greek Interlinear
Church Fathers on John 9:20
The Pharisees being unable, by intimidation, to deter the blind man from publicly proclaiming his Benefactor, try to nullify the miracle through the parents. But the Jews did not believe concerning him, that he had been blind, and received his sight, until they had called the parents of him that had received his sight.
Either, say they, it is not true that he now sees, or it is untrue that he was blind before: but it is evident that he now sees; therefore it is not true that he was born blind.
As if to say, We might justly be compelled to speak for an infant, that could not speak for itself: but he, though blind from his birth, has been always able to speak.