Thomas, one of the twelve apostles, who was called Didymus, wasn't with them when Jesus came.
The other disciples told him, "We've seen the Lord." Thomas told them, "I refuse to believe this unless I see the nail marks in his hands, put my fingers into them, and put my hand into his side."
A week later Jesus' disciples were again in the house, and Thomas was with them. Even though the doors were locked, Jesus stood among them and said, "Peace be with you!"
Then Jesus said to Thomas, "Put your finger here, and look at my hands. Take your hand, and put it into my side. Stop doubting, and believe."
Thomas responded to Jesus, "My Lord and my God!"
Jesus said to Thomas, "You believe because you've seen me. Blessed are those who haven't seen me but believe."
Jesus performed many other miracles that his disciples saw. Those miracles are not written in this book.
But these miracles have been written so that you will believe that Jesus is the Messiah, the Son of God, and so that you will have life by believing in him.