Rereading Romans from the Perspective of Paul's Gospel

Paul did not write a systematic theology or specific church doctrines when he wrote Romans. His audience was Roman Christians, and his last will was to preach the gospel to all, especially gentiles in Spain. Through this letter, Paul wants to pave the way for a visit to Rome and expects their support on his mission trip to Spain. The question is this: What kind of the gospel does he want to share ...