How did Saul's identity change from a prominent Jew to a servant of Jesus Christ?

Les explains that after Saul arose from the earth and his eyes were opened, he saw no man; they led him by the hand into Damascus, and he was three days without sight, food, and water. Les teaches that Saul was going through a death, burial, and resurrection even in his own life. He was moving from the big man in Judaism to that lowly servant whom he later describes in Ephesians chapter 3 as a prisoner of Jesus Christ for the Gentiles. Les compares this to Jonah, who was three days and three nights in the whale’s belly, became a changed man, and then went to Nineveh. Saul would now become Paul, and he too would go primarily to the Gentiles. Les also notes that Saul was unique: he was a Jew of the tribe of Benjamin, a Pharisee of the Pharisees, and later Acts shows Paul was also a Roman by birth and citizenship because his father was.