Letter to the romans
The most important concept described is the justification through faith. The complete justification in front of God is impossible by following commandments and laws. Instead he teaches that complete justification is possible only through Jesus Christ.
St. Paul was extremely disturbed to hear about the differences, extremely bad way of life and morale failure in Corinth. He noticed that the people used to approach foreign and gentile judges because of these differences, wrong teachings regarding food sacrificed to idols and errors in the Holy sacraments. They had doubts regarding marriage, divorce, re-marriage etc. St. Paul wrote this letter to answer and correct all these.
1)Explanation of St. Paul regarding his mission (Chapter 1-7)
2)About the fund collected by St. Paul for the saints (8-9)
3)St. Paul declares his apostolic benediction (10-13).
4)Second letter concludes with the blessing in the name of Holy Father, Holy Son and Holy Spirit (13:13)
This letter was not written to the Church in a particular city. Instead it was written to multiple Churches in a very big area.
He continues to explain about his apostolic benediction from Jesus Christ and recognition he received from the apostles and disciples of Jesus Christ at Jerusalem (1:11, 2:20). Salvation through faith and salvation through grace are not according to the commandments (of Old Testament) but according to faith. Commandments blame people and bind them according to its rules. On the other hand faith releases people to enjoy the grace through Jesus Christ (3:1, 4:31). This freedom is provided to bear the fruits of spirit (5:1-26). The letter concludes by giving some advices regarding the practical life (6:1-18)
Evangelical Epistles give more importance to the gospel of Jesus Christ and describes it further giving correct details.