John Calvin on John 9:17

17. They say to him who had been blind. The more diligently they inquire, the more impressively does the truth of God appear; for they act as if one were endeavoring to extinguish a strong flame “Une grande flamme.” by his breath. Thus, when we see wicked men contrive all that they can to crush the truth of God, we have no reason to be afraid, or to be excessively anxious about the result, for all that they can gain in this way will be to cause its light to burn with greater brightness.

What sayest thou of him? When they ask the blind man what is his opinion, they do so, not because they wish to abide by his judgment, or set any value on it, but because they hope that the man, struck with fear, will reply according to their wish. In this respect the Lord disappoints them; for when a poor man disregards their threatenings, and boldly maintains that Christ is a Prophet, we ought justly to ascribe it to the grace of God; so that this boldness is another miracle. And if he so boldly and freely acknowledged Christ to be a Prophet, though he did not as yet know that the Lord Jesus “Le Seigneur Jesus.” was the Son of God, how shameful is the treachery of those who, subdued by fear, either deny him, or are silent respecting him, though they know that he sitteth at the right hand of the Father, and that he will come thence to be the Judge of the whole world! Since this blind man did not quench a small spark of knowledge, we ought to endeavor that an open and full confession may blaze forth from the full brightness which has shone into our hearts.

John 9:18-23

18. But the Jews did not believe respecting him, that he had been blind and had received his sight, until they called the parents of him who had received his sight. 19. And they asked them, saying, Is this your son who, you say, was born blind? How then doth he now see? 20. His parents answered and said, We know that this is our son, and that he was born blind. 21. But how he now seeth, we know not; or who hath opened his eyes, we know not; he is of age, ask him, he will speak of himself. 22. These things said his parents, because they feared the Jews; for the Jews had already determined that, if any man confessed that he was the Christ, he should be thrown out of the synagogue. 23. On this account his parents said, He is of age, ask him.