Summary. Paul begins 1 Corinthians with a greeting to “the church of God that is in Corinth,” in which he offers thanks for the faith and strength of the Corinthian church (1:2). He immediately begins, however, to list and address the problems that plague that church.
Paul wrote 1 Corinthians from Ephesus, where he had been ministering for three years. He sent this letter to the church by Timothy (1 Cor. 4:17), but problems in the church only grew worse. Perhaps it was young Timothy's timidity that made the believers at Corinth disobey Paul's words. At any rate, Paul then sent Titus to Corinth to make sure the church obeyed the apostolic orders Paul had given them (2 Cor. 7:13-15). (Wiersbe's Expository Outlines)
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.