1Paul, a servant of Jesus Christ, called to be an apostle, separated unto the gospel of God,Next Verse 2
The Epistle to the Romans or Letter to the Romans, often shortened to Romans, is the sixth book in the New Testament. Biblical scholars agree that it was composed by the Apostle Paul to explain that salvation is offered through the gospel of Jesus Christ. It is the longest of the Pauline epistles  and is often considered his "most important theological legacy" and magnum opus.
In the opinion of Jesuit scholar Joseph Fitzmyer, the book "overwhelms the reader by the density and sublimity of the topic with which it deals, the gospel of the justification and salvation of Jew and Greek alike by the grace of God through faith in Jesus Christ, revealing the uprightness and love of God the Father."