Paul had immense joy in the Lord. He loved the people he ministered to, experienced joy upon joy when he saw them living right before God.
Paul was a servant of Jesus Christ, and diligent no matter the circumstance. Even while in prison, his aim was to follow the Lord and to strengthen the Church.
Paul described himself as the Chief of Sinners. Yet, despite his great sin, God used him to spread the Gospel to the Gentile world.