Justification by Faith - The Greatest Gift of Paul

In second corinthians 12, paul says in six even if i should choose to boast, i would not be a fool because i would be speaking the truth. He has everything to brag about, but he doesn't. Paul was responsible for delivering the theology that we still study two millennia later. Justification by faith is a doctrine that we would not know about as we know about it, if it had not been for paul.