But Saul's preaching became even more powerful, and his proofs that Jesus was the Messiah were so convincing that the Jews who lived in Damascus could not answer him.
and explaining the Scriptures, and proving from them that the Messiah had to suffer and rise from death. “This Jesus whom I announce to you,” Paul said, “is the Messiah.”
So they set a date with Paul, and a large number of them came that day to the place where Paul was staying. From morning till night he explained to them his message about the Kingdom of God, and he tried to convince them about Jesus by quoting from the Law of Moses and the writings of the prophets.
All who heard him were amazed and asked, “Isn't he the one who in Jerusalem was killing those who worship that man Jesus? And didn't he come here for the very purpose of arresting those people and taking them back to the chief priests?”
Then Barnabas came to his help and took him to the apostles. He explained to them how Saul had seen the Lord on the road and that the Lord had spoken to him. He also told them how boldly Saul had preached in the name of Jesus in Damascus.
God purposely chose what the world considers nonsense in order to shame the wise, and he chose what the world considers weak in order to shame the powerful.