For I delivered to you as of first importance what I also received: that Christ died for our sins in accordance with the Scriptures, that he was buried, that he was raised on the third day in accordance with the Scriptures,
1 Cor 15:3-4
The idea that a messiah would come, die and rise from death is so improbable that any rational person would dismiss the idea as preposterous. Or at least they would have done before 33 AD. Yet this most outrageous claim is exactly the claim that was being made by the bible - as Peter points out in Acts 2:25-26, when he quotes and expounds Psalm 16. A mere 50 days earlier, Peter had no expectation of Jesus' resurrection. On Good Friday, it seemed irrational, and on easter morning, the empty tomb was inexplicable. Yet as he re-reads scripture in light of the resurrection, he sees it as inevitable - he declares that any other outcome was impossible.
It is this same point that Paul emphasises as he writes to the christians in Corinth: Jesus rose from death exactly as scripture prophesied he would. And Jesus rose from death demonstrating that scripture is a more reliable guide to reality than human expectation or reason.
Jesus rose from death so that we would trust scripture more than we trust ourselves.