Thomas has been called "doubting Thomas" because of his initial reluctance to believe in the Lord's resurrection, but neither the Lord nor the other disciples ever viewed him in such a light. His later ministry, as the first missionary/martyr to India, speaks clearly of his great faith.
It is only in John's gospel that we have any specific insight into Thomas' character. When the other disciples sought to dissuade Jesus from returning to Jerusalem, it was Thomas who urged, "Let us also go, that we may die with him" (John 11:16). Thomas understood the dangers awaiting them, but was ready to go wherever Jesus desired him to go. In the upper room when Jesus spoke of going away, Thomas, still willing to go with Him anywhere, was the only one to ask, "Lord, we know not whither thou goest; and how can we know the way?" (John 14:5). Then, just a few hours later, the Lord had been crucified, and soon "the doors were shut where the disciples were assembled for fear of the Jews" (John 20:19) as they hid themselves in the upper room.
But Thomas was not hiding! The Scriptures do not say where he was when Jesus appeared in their midst, but he was not hiding there like the others. He may well have been out working or witnessing, doing whatever he could to follow the Lord, but he (like the others) had failed to understand Jesus' promise that He would rise again.
When the other disciples reported that they had seen the resurrected Lord, Thomas, realizing the tremendous significance of such a miracle if it were true, insisted he must see the proof firsthand. Then, when he saw the Lord, he showed a higher comprehension of what had taken place than any of the others, as he whispered in awe: "My Lord, and my God!" HMM