Perhaps the transformation of the disciples of Jesus is the greatest evidence of all for the resurrection. At the time of His death they were very much afraid. Peter went to the extent of vehemently denying that he knew Christ. But in a few days this same Peter fearlessly proclaimed the Gospel in the same city. Listen to his audacity: “The God of Abraham, Isaac and Jacob, the God of our fathers, has glorified His servant Jesus. You handed Him over to be killed, and you disowned him before Pilate, though He had decided to let him go. You disowned the Holy and righteous One and asked that a murderer be released to you” (Acts 3:13-14). There had to have been a sufficient reason for such a transformation.
John Stott