Paul believed, in fact, that Jesus had gone through death and out the other side. Jesus had gone into a new mode of physicality, for which there was no precedent and of which there was, as yet, no other example.
What Jesus did was not a mere example of something else, not a mere manifestation of some larger truth; it was itself the climactic event and fact of cosmic history. From then on everything is differentthe End came forward into the present in Jesus the Messiah
One of the reasons we do history, in fact, is because it acts as a brake, a control, on our otherwise unbridled enthusiasm for our own ideas.
It is faith alone that justifies, but faith that justifies can never be alone, though one is justified by faith alone, the faith which justifies is never in fact alone.
In the New Testament outside the Gospels and the beginning of Acts, again and again, the fact of Jesus' resurrection is closely linked to our own ultimate resurrection, which isn't life after death - it's life after life after death.