When the disciples are resisting Jesus' decision to return to Judea, where Jesus' fellow Jews had previously tried to stone him. Jesus is determined, and Thomas says bravely: "Let us also go, that we might die with him". Thomas is not known for this bravery so much.
He doubts the resurrection of Jesus and demands to touch Jesus' wounds before being convinced that he has been resurrected in reality. He touches his wounds and then convinced.
We all get convinced, either before or after. Just a matter of time.
