There is only one basic reason why Christianity exists and that is the fact that Jesus Christ truly rose from the grave.
The disciples never expected the resurrection. The unanimous testimony of all four Gospels is that the terrible death of Jesus on the cross entirely dashed all their hopes about Jesus and about his message. He was dead, and that was the end of it. They looked for nothing more, and they expected nothing more.
So as much as they had loved him, in their eyes Jesus was a failed messiah. His dying seemed to entirely rob both his teaching and even his miracles of any lasting significance.
And they were clearly terrified that his awful fate, at the hands of the Sanhedrin and the Romans, could easily become their awful fate. So they hid, trembling with terror, behind shuttered windows and locked doors.
When the Risen Christ suddenly appeared in their midst, their reaction was shocked incredulity. They simply could not believe their own eyes.
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