By making such a public statement, he gave critics a chance to check out his claims for themselves. The apostles went through a dramatic change. Within a few weeks, they were standing face to face with the ones who had crucified their leader. Their spirit was like iron. They became unstoppable in their determination to sacrifice everything for the one they called Savior and Lord.
History is full of martyrs.
Countless men and women have died for their beliefs. For that reason, it is not that significant to point out that the first disciples were willing to suffer and die for their faith. But it is significant that while many will die for what they believe to be the truth, few if any will die for what they know to be a lie. That psychological fact is important because the disciples of Christ did not die for deeply held beliefs about which they could have been honestly mistaken. They died for their claims to have seen Jesus alive and well after His resurrection.