If we had wondered why God would have chosen a man like Paul to become a leader in the Christian church, this verse gives us a pretty good indication. Paul was a scholar in the Hebrew Scriptures, and knew God's story well. His persecution of the early church, prior to his conversion, had been part of his passion for God's story. Now that he sees God's story more fully, there is nobody better than him to tell it. He is able to help the Jewish believers understand how it all fits together, especially those like himself who may not know how Jesus fits until someone shows them.