John Chrysostom
“Of whom you say that he was born blind,” as though they had maliciously invented this out of devotion to Christ. O lawless and utterly lawless men! What father would dare to lie in this way about his own son?
They say almost this: “the one whom you have passed off as blind.” And not only this, but “you have spread the rumor of it everywhere. How then does he now see?” What madness! They are saying, “This is your craft and device.”
Thus, by saying, “of whom you say,” and, “how then does he now see,” they try through both expressions to dispose the parents to deny him. Of the three proposed questions, whether he is their son, whether he was blind, and how he received sight, the parents answer only two and do not answer the third.
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Yet even this served to establish the truth, because no one else answered the third question, but the healed man himself. In this case he is the trustworthy witness. After this, is it possible to suppose that the parents were showing favor, when from fear of the Jews they kept silent about something even among the things they knew?
What then do they say? The blind man's parents appeared. Again there was the same manner of questioning as in verse 15.