...is the witness of the apostles.
Sure, the apostles could have all conspired together to make up a
fantastic story of the man who was crucified but came back to life. It
would've been very difficult to get all their facts perfectly straight
and to steal the body but I suppose these things are at least possible.
What seems less reasonable to
believe—less reasonable than a man coming back to life by the hand of
God—is that each and every apostle would hold fast to a lie in the face
of torture and persecution.
Of all the apostles only John died
of natural causes, though he was exiled to a prison island toward the
end of his life. All the rest were killed for their teachings about
Jesus' resurrection. Not a single one broke faith or relented their
beliefs in the face of unspeakable suffering.
What lie is worth enduring torture and death?
That the apostles who saw the risen Lord endured to the bitter end yet another reason Catholics believe in the resurrection.