Paul was not ashamed because his message was the gospel of Christ, the Good News. It was a message of salvation, it had life-changing power, and it was for everyone. When you are tempted to be ashamed, remember what the Good News is all about. If you focus on God and on what God is doing in the world rather than on your own inadequacy, you won’t be ashamed or embarrassed.
For I am not ashamed of this Good News about Christ. It is the power of God at work, saving everyone who believes—the Jew first and also the Gentile. (Romans 1:16 NLT)