John 9:3

"Neither hath this man sinned, nor his parents." This He saith not as acquitting them of sins, for He saith not simply, "Neither hath this man sinned, nor his parents," but addeth, "that he should have been born blind" - "but that the Son of God should be glorified in him." "For both this man hath sinned and his parents, but his blindness proceedeth not from that." And this He said, not signifying that though this man indeed was not in such case, yet that others had been made blind from such a cause, the sins of their parents, since it cannot be that when one sinneth another should be punished. For if we allow this, we must also allow that he sinned before his birth. As therefore when He declared, "neither hath this man sinned," He said not that it is possible to sin from one's very birth, and be punished for it; so when He said, "nor his parents," He said not that one may be punished for his parents' sake.

"That the glory of God should be made manifest," He saith. Lo, here again is another difficulty, if without this man's punishment, it was not possible that the glory of God should be shown. Certainly it is not said that it was impossible, for it was possible, but, "that it might be manifested even in this man." "What," saith some one, "did he suffer wrong for the glory of God?" What wrong, tell me? For what if God had never willed to produce him at all? But I assert that he even received benefit from his blindness: since he recovered the sight of the eyes within. What were the Jews profited by their eyes? They incurred the heavier punishment, being blinded even while they saw. And what injury had this man by his blindness? For by means of it he recovered sight. As then the evils of the present life are not evils, so neither are the good things good; sin alone is an evil, but blindness is not an evil. And He who had brought this man from not being into being, had also power to leave him as he was.

But when He said, "That the glory of God might be manifested," He spake of Himself, not of the Father; His glory was already manifest. For since they had heard that God made man, taking the dust of the earth, so also Christ made clay. To have said, "I am He who took the dust of the earth, and made man," would have seemed a hard thing to His hearers; but this when shown by actual working, no longer stood in their way. So that He by taking earth, and mixing it with spittle, showed forth His hidden glory; for no small glory was it that He should be deemed the Architect of the creation.

(Tr. xliv. 3) Was he then born without original sin, or had he never added to it by actual sin? Both this man and his parents had sinned, but that sin was not the reason why he was born blind. Our Lord gives the reason; viz. That the works of God should be made manifest in him.

(in Præf. Moral. c. 5) One stroke falls on the sinner, for punishment only, not conversion; another for correction; another not for correction of past sins, but prevention of future; another neither for correcting past, nor preventing future sins, but by the unexpected deliverance following the blow, to excite more ardent love of the Saviour's goodness.