Romans Week 1: The Reason for Romans The Church at Rome Paul wrote this letter to Rome during a three-month stay in Greece, likely while in Corinth at Gaius's home. Clearly, this became his magnum opus. It is the first systematic theology of the Christian faith. This letter may be considered the believer’s constitution—the Christian Magna Carta. Paul condenses the entirety of the book of Romans into 54 words. Romans 1:16–17 Salvation has always been: By grace alone….