Paul has experienced the riches of being in relationship with Jesus. He defines these riches as an inheritance. Amazingly Paul is willing to experience great stress and hardship in order to share these riches with anyone, including the highest of human authority. This is simply amazing!
"The eyes of your understanding being enlightened; that you may know what is the hope of His calling, what are the riches of the glory of His inheritance in the saints."
- Ephesians 1:8