John Chrysostom — as excerpted in the Catena Aurea on John 9:18-23

“(Hom. lviii. 3) But it is the nature of truth, to be strengthened by the very snares that are laid against it. A lie is its own antagonist, and by its attempts to injure the truth, sets it off to greater advantage: as is the case now. For the argument which might otherwise have been urged, that the neighbours knew nothing for certain, but spoke from a mere resemblance, is cut off by introduction of the parents, who could of course testify to their own son. Having brought these before the assembly, they interrogate them with great sharpness, saying, Is this your son, (they say not, who was born blind, but) who ye say was born blind? Say. Why what father is there, that would say such things of a son, if they were not true? Why not say at once, Whom ye made blind? They try two ways of making them deny the miracle: by saying, Who ye say was born blind, and by adding, How then doth he now see?”