The Gospel, The Power of God.

Romans 1:14-17 (CSB)
¹⁴ I am obligated both to Greeks and barbarians, both to the wise and the foolish. ¹⁵ So I am eager to preach the gospel to you also who are in Rome.
The Righteous Will Live by Faith
¹⁶ For I am not ashamed of the gospel, because it is the power of God for salvation to everyone who believes, first to the Jew, and also to the Greek. ¹⁷ For in it the righteousness of God is revealed from faith to faith, just as it is written: The righteous will live by faith.