John 9:39

When he had worshiped, Christ said, "For judgment I am come into the world, that they which see not might see, and that they which see might be made blind." So also saith Paul; "What shall we say then? That the Gentiles which followed not after righteousness have attained to righteousness, even the righteousness which is of the faith of Jesus; but Israel, which followed after the law of righteousness, hath not attained to the law of righteousness." (Rom. ix. 30, 31.) By saying, "For judgment I am come into this world," He both made the man stronger respecting the faith, and aroused those who followed Him; for the Pharisees were following Him. And the, "For judgment," He spake with reference to a greater punishment; showing that they who had given sentence against Him, had received sentence against themselves; that they who had condemned Him as a sinner, were themselves the persons condemned. In this passage He speaketh of two recoveries of sight, and two blindnesses; one sensible, the other spiritual.

To this I have found something similar written in the Gospel according to John: "for judgment I have come into this world, that those who do not see may see, and those who see may be made blind". Therefore, just as he came for judgment, that "those who do not see" of the nations "might see", and those who saw before, of Israel, "might be made blind", so he came "for the fall and rising of many". For at the coming of the Lord the Savior, those who had stood before fell down, and those who had fallen rose up. … We all have in ourselves both sight and blindness. Adam both saw and did not see. … There is an eye of the body, with which we behold these earthly things, an eye according to the sense of the flesh, of which the Scripture says: "walking vainly, puffed up by the sense of the flesh". To this we have another, contrary and better, that savors of divine things; and because it was blind in us, Jesus came to make it see, that those who did not see might see, and those who saw might be made blind.

What Jesus said elsewhere, namely, "God did not send his Son into the world to condemn the world, but in order to save it," is not contrary to this statement. For there it states the purpose of Jesus' coming: that all people may be saved. Here he talks about the outcome of his coming. In fact, even though this is his will, that is, to save all people, the unbelievers nonetheless must be absolutely punished because of their choice not to believe. Here he indicates what seems to be the outcome of these events. As is only reasonable, he says, I came to test individuals in order to ascertain who are blind and who are able to see. Now he who was believed to be blind, twice received eyes to see. He received bodily eyes and, to the perfection of his soul, he received saving doctrine. Those [i.e., the Pharisees] who think they see with bodily eyes, who have been entrusted with the teaching of the precepts of the law, appear to be blind, both because they do not accept the truth and because they do not believe the works that they have seen with their own eyes.