For I am not ashamed of the gospel, because it is the power of God that brings salvation to everyone who believes: first to the Jew, then to the Gentile. For in the gospel the righteousness of God is revealed — a righteousness that is by faith from first to last, just as it is written: “The righteous will live by faith.” Romans 1:16-17
This quotation from Habakkuk that Paul uses is the great fact that he is expounding in the gospel. He is not ashamed of it, and that is a way of saying that he is proud of it.
Paul especially is not ashamed of the gospel in Rome because the Romans appreciated power, just as Americans do. The Romans prided themselves on their power. They had military power that could conquer all the nations that stood in their path; they had a tremendous program of road-building; they had some of the greatest law-makers of history; they had the power to write literature and create art. But Paul knew that the Romans also were powerless when it came to changing hearts. …