Why was Paul not ashamed of the gospel?
Paul was not ashamed of the gospel because it is the power of God unto salvation. The gospel is the message that Christ died for our sins, was buried, and rose again. This one gospel is the means by which God saves, as stated in Romans 1:16.
Les teaches that the gospel Paul was not ashamed of is the one he consistently preached: that Christ died for our sins, was buried, and rose again. This same gospel appears in 1 Corinthians 15, 1 Corinthians 1, Ephesians 1, and other epistles. Les emphasizes that it is the power of God unto salvation, and he stresses this from program to program. He directs listeners back to Romans 1:16 and then to Hebrews 11.
For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek.