24 But Thomas, one of the twelve, called Didymus, was not with them when Jesus came.
25 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 print of the nails, and thrust my hand into his side, I will not believe.
26 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.
27 Then saith he to Thomas, reach hither thy finger, and behold my hands; and reach hither thy hand, and thrust it into my side: and be not faithless, but believing.
28 And Thomas answered and said unto him, My Lord and my God.
29 Jesus saith unto him, Thomas, because thou hast seen me, thou hast believed: blessed are they that have not seen, and yet have believed.
30 And many other signs truly did Jesus in the presence of his disciples, which are not written in this book:
31 But these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name.
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The first thing that comes to mind about Thomas is that he is a person like many of us, combining faith with little faith. But Thomas differs from us in this: although he was nicknamed unbelieving, he nevertheless possessed far greater faith than many of us who would like to compare our excessive rational skepticism, which eats away at the soul, with Thomas's desire to find firm foundations for faith. Let us not forget that Thomas was ready to follow the Teacher to the end, and he proved this by his whole life. But what is true is true: it was hard for him to trust immediately any news he heard; he wanted confirmation and proof.
There is truth in such caution: how many rumors there are about "spiritual manifestations" produced by a game of telephone or by hallucinations, or even coming from a poisoned source. Christ, by the way, did not reject Thomas's desire to be convinced through personal verification, and He gave him that opportunity.
There are iconographic depictions in which Thomas literally puts his finger into Christ's wound, but the Gospel text does not say that he used the opportunity given to him. It tells something else: immediately after Christ invited him to put his hand into His side, Thomas confessed Him as his Lord and God. Christ did not count Thomas's doubts as sin.
No doubts, not one difficult question, will in the end remain without God's answer. Only let doubts not become a pretext for the self-assertion of a proud sophist, who, like Pilate, rejects the possibility of knowing the truth, but instead arise from a conscientious desire to overcome the difficulties on the way to it.