Today's first reading at Mass came from 1 Corinthians 15. Paul told that Jesus, after he was raised, appeared to Cephas, then to the twelve, and then to more than five hundred at once, most of whom still living at the time Paul wrote his letter. Next, Jesus appeared to James, then to all the Apostles again. Last, he appeared to Paul. All these appearances point irrefutably to the Resurrection of the Lord.