Book of Romans Summary: The Gospel of God’s Righteousness. Paul’s letter to the Romans is his most thorough explanation of the gospel. Written to a church he had not yet visited, Romans lays out the righteousness of God revealed in Jesus Christ — available to Jew and Gentile alike through faith. Romans is both theological and practical: it begins with the universal problem of sin, moves to justification by faith, and ends with how believers should live together in unity and m