But Thomas, one of the twelve, 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 print of the nails, and thrust 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 thrust it into my side: and be not faithless, but believing.
 And Thomas answered and said unto him, My Lord and my God.
 Jesus saith unto him, Thomas, because thou hast seen me, thou hast believed: blessed are they that have not seen, and yet have believed.
Why is it that some people believe the gospel and others do not? Perhaps the experience of Thomas can supply at least some of the answers to this question. From this text we can observe three barriers to faith that Thomas had to overcome in order to believe in the resurrected Lord.