Romans 1:16-17: For I am not ashamed of the gospel of Christ for it is the power of God unto salvation to everyone who believes, to the Jew first and also to the Greek, for therein is the righteousness of God revealed from faith to faith according as it is written, the just shall live by faith.

The revelation of righteousness is the revelation of the gospel. The book of Romans is a revelation of the righteousness of God. When we come to understand the righteousness of God, it empowers God to work salvation in our lives.