Paul wrote the book of Romans from prison in 57-58 AD to the church in Rome. He explains that salvation is through faith in Christ alone, not works, and is available to both Jews and Gentiles. The book addresses issues in the Roman church related to divisions between Jews and Gentiles over the role of the Mosaic law. It provides a systematic theology on sin, justification by faith, sanctification, Israel's past and future, and other doctrines to prepare the Romans for Paul's planned visit.