He was a student of Rabbi Gamaliel, and converted by the direct revelation of Jesus Christ, on the road to Damascus.
Paul’s preaching often either converted his listeners or left them enraged, and they often had him stoned, beaten with rods, flogged, imprisoned and falsely accused. When he reached the end of his earthly journey, he was beheaded in Rome – according to Tradition, on the same day St. Peter was crucified.
Now that’s great preaching!