As the letter states, Paul is the author (see 1:1). With almost no exception, from the early church this epistle has been credited to Paul. The letter contains a number of historical references that agree with known facts of Paul’s life and the doctrinal content of the book is consistent with the other writings of the apostle, a fact quickly evident by a comparison with his other letters.
A few examples must suffice: the doctrine of justification by faith (Rom 3:20-22; Gal 2:16); the church as the body of Christ appointed to represent and serve him through a variety of spiritual gifts (Rom 12; 1 Cor 12); the collection for the poor saints at Jerusalem (Rom 15:25-28; 2 Cor 8-9). Understandably, Paul makes fewer references to himself and to his readers in Romans than in 1 and 2 Corinthians and Galatians, since he had not founded the Roman church and guided its struggles to maturity as he had the others.
The only question concerning the authorship revolves around chapter 16. Ryrie writes:
The mention by name of 26 people in a church Paul had never visited (and particularly Priscilla and Aquila, who were most recently associated with Ephesus, Acts 18:18-19) has caused some scholars to consider chap. 16 as part of an epistle sent to Ephesus. It would be natural, however, for Paul to mention to a church to which he was a stranger his acquaintance with mutual friends. Paul’s only other long series of greetings is in Colossians—a letter also sent to a church he had not visited.
Romans, which has been called his “greatest work” or his “magnum opus,” gets its title from the fact it was written to the church in Rome (1:7, 15). Paul did not establish the church in Rome, but as the apostle to the Gentiles, he had longed for many years to visit the believers in Rome (15:22-23) that he might further establish them in the faith and preach the gospel there as well (1:13-15).
Being anxious to minister in Rome, he wrote Romans to prepare the way for his visit (15:14-17). It was written from Corinth, while completing the collection for the poor in Palestine. From there he went to Jerusalem to deliver the money, intending to continue on to Rome and Spain (15:24). Paul did eventually get to Rome, but as a prisoner. It appears that Phoebe, who belonged to the church at Cenchrea near Corinth (16:1), carried the letter to Rome.
Romans was written in about A.D. 57-58 most likely near the end of his third missionary journey (Acts 18:23-21:14; see also Rom. 15:19). In view of Paul’s statement in Rom. 15:26, it appears Paul had already received contributions from the churches of Macedonia and Achaia (where Corinth was located). This means he had already been at Corinth and since he had not yet been at Corinth when he wrote to that church (cf. 1 Cor. 16:1-4; 2 Cor. 8-9), the writing of Romans must follow that of 1 and 2 Corinthians which is dated about A.D. 55.
Unlike some of his other epistles, Romans was not written to address specific problems. Rather, three clear purposes unfold for the writing of Romans. The first was simply to announce Paul’s plans to visit Rome after his return to Jerusalem and to prepare the church for his coming (15:24, 28-29; cf. Acts 19:21). Paul wanted to inform them of his plans and to have them anticipate and pray for their fulfillment (15:30-32). A second purpose was to present a complete and detailed statement of the gospel message God had called him to proclaim. The apostle was not only ready “to preach the gospel also to you who are at Rome” (1:15), but he wanted them to have a clear understanding of its meaning and ramifications in all of life—past (justification), present (sanctification), and future (glorification). A third purpose is related to the questions that naturally arose among the Jewish and the Gentile Christians at Rome like what does the gospel do to the Law and such Old Testament rites like circumcision? And what about the Jew? Has God set the Jew aside? Had He forgotten His promises to the Jews? So Paul explains God’s program of salvation for Jews and Gentiles.
Paul’s theme or seed plot in Romans is clearly stated in 1:16-17. In this the apostle shows how God saves the sinner. In these verses, the great themes of the epistle are gathered together—the gospel, the power of God, salvation, everyone, who believes, righteousness from God, Jew and Gentile. Ryrie has an excellent summary of the theme and contents:
More formal than Paul’s other letters, Romans sets forth the doctrine of justification by faith (and its ramifications) in a systematic way. The theme of the epistle is the righteousness of God (1:16-17). A number of basic Christian doctrines are discussed: natural revelation (Rom 1:19-20), universality of sin (Rom 3:9-20), justification (Rom 3:24), propitiation (Rom 3:25), faith (Rom 4:1), original sin (Rom 5:12), union with Christ (Rom 6:1), the election and rejection of Israel (Rom 9-11), spiritual gifts (Rom 12:3-8), and respect for government (Rom 13:1-7).
Various forms of the words “righteous” and “righteousness” are sprinkled abundantly throughout Romans. The Greek noun dikaiosune„, “righteousness,” occurs 34 times, the noun didaio„ma, “a righteous deed, acquittal, ordinance,” five times, the noun dikaiokrisia (righteous judgment) once, the adjective dikaios, “righteous,” occurs seven times, the noun dikaio„sis, “justification, acquittal,” twice, and the verb dikaioo„, “declare or show to be righteous,” occurs 15 times for a total of 64 occurrences.
Picking out key chapters in Romans is indeed difficult for in this great treatise on doctrine and its application to life, one wants to say every chapter is key. But certainly two sections of the book do stand out.
Paul presents Jesus Christ as the Second Adam whose righteousness and substitutionary death have provided justification for all who place their faith in Him. He offers His righteousness as a gracious gift to sinful men, having borne God’s condemnation and wrath for their sinfulness. His death and resurrection are the basis for the believer’s redemption, justification, reconciliation, salvation, and glorification.
Apart from the introduction (1:1-17), where Paul also states his theme, and conclusion, where he has personal messages and a benediction (15:14–16:27), Romans easily divides into three sections: