John 20:28

Seest thou that his doubt proceeded from unbelief? But it was before he had received the Spirit; after that, it was no longer so, but, for the future, they were perfected. And not in this way only did Jesus rebuke him, but also by what follows; for when he, being fully satisfied, breathed again, and cried aloud, "My Lord, and my God," He saith, "Because thou hast seen Me, thou hast believed; blessed are they who have not seen, and yet have believed." For this is of faith, to receive things not seen; since, "Faith is the substance of things hoped for, the evidence of things not seen." And here He pronounceth blessed not the disciples only, but those also who after them should believe. "Yet," saith some one, "the disciples saw and believed." Yes, but they sought nothing of the kind, but from the proof of the napkins, they straightway received the word concerning the Resurrection, and before they saw the body, exhibited all faith. When therefore any one in the present day say, "I would that I had lived in those times, and had seen Christ working miracles," let them reflect, that, "Blessed are they who have not seen, and yet have believed." It is worth enquiring, how an incorruptible body showed the prints of the nails, and was tangible by a mortal hand. But be not thou disturbed; what took place was a matter of condescension. For that which was so subtle and light as to enter in when the doors were shut, was free from all density; but this marvel was shown, that the Resurrection might be believed, and that men might know that it was the Crucified One Himself, and that another rose not in His stead. On this account He arose bearing the signs of the Cross, and on this account He eateth. At least the Apostles everywhere made this a sign of the Resurrection, saying, "We, who did eat and drink with Him." As therefore when we see Him walking on the waves before the Crucifixion, we do not say, that that body is of a different nature, but of our own; so after the Resurrection, when we see Him with the prints of the nails, we will no more say, that he is therefore corruptible. For He exhibited these appearances on account of the disciple.

(Tr. cxxi) Thomas saw and touched the man, and confessed the God whom he neither saw nor touched. By means of the one he believed the other undoubtingly: Thomas answered and said unto Him, My Lord and my God.

He who had been before unbelieving, after touching the body showed himself the best divine; for he asserted the twofold nature and one Person of Christ; by saying, My Lord, the human nature, by saying, My God, the divine, and by joining them both, confessed that one and the same Person was Lord and God. Jesus saith unto him, Because thou hast seen Me, thou hast believed. Here He means the disciples who had believed without seeing the print of the nails, and His side.

"But Thomas, one of the twelve, who is called Didymus, was not with them when Jesus came. The other disciples therefore said unto him, We have seen the Lord. But he said unto them, Except I shall see in His hands the print of the nails, and put my finger into the place of the nails, and put my hand into His side, I will not believe. And after eight days, again His disciples were within, and Thomas with them. Then came Jesus, the doors being shut, and stood in the midst, and said, Peace be unto you. Then saith He to Thomas, Reach hither thy finger, and behold my hands; and reach hither thy hand, and put it into my side: and be not faithless, but believing. Thomas answered and said unto Him, My Lord and my God." He saw and touched the man, and acknowledged the God whom he neither saw nor touched; but by the means of what he saw and touched, he now put far away from him every doubt, and believed the other. "Jesus saith unto him, Because thou hast seen me, thou hast believed." He saith not, Thou hast touched me, but, "Thou hast seen me," because sight is a kind of general sense. For sight is also habitually named in connection with the other four senses: as when we say, Listen, and see how well it sounds; smell it, and see how well it smells; taste it, and see how well it savors; touch it, and see how hot it is. Everywhere has the word, See, made itself heard, although sight, properly speaking, is allowed to belong only to the eyes. Hence here also the Lord Himself says, "Reach hither thy finger, and behold my hands:" and what else does He mean but, Touch and see? And yet he had no eyes in his finger. Whether therefore it was by looking, or also by touching, "Because thou hast seen me," He says, "thou hast believed." Although it may be affirmed that the disciple dared not so to touch, when He offered Himself for the purpose; for it is not written, And Thomas touched Him. But whether it was by gazing only, or also by touching that he saw and believed, what follows rather proclaims and commends the faith of the Gentiles: "Blessed are they that have not seen, and yet have believed." He made use of words in the past tense, as One who, in His predestinating purpose, knew what was future, as if it had already taken place.