The Apostle Paul writes to the world-renowned believers in Rome, the center of the world at that time, in order to answer a slanderous charge made to them against Paul and his message. Paul’s detractors claim his emphasis on faith overturns the law. Paul says that ” just living by the law” does not achieve personal justice before God, while “just living by faith” does. Paul then demonstrates what a just life looks like: harmonious living with Jesus as the leader. Paul also makes clear the choice a believer has: to walk in faith and the power of the resurrection and experience resurrection life, or walk in sin and unnecessarily experience the negative consequences.
Righteousness does not come by the law, but by faith. Paul uses two quotes from the Old Testament to demonstrate the point. Rules do not make people righteous, because rules do not change the heart. The path to righteousness starts with faith. Believe, speak/think on those beliefs, then do them. It is very simple, you do what you know is true and right. Paul summarizes these Old Testament passages by simply saying believe and confess. That is how faith turns into righteousness, you think or say what is true then do what is true.
Paul contrasts the Gentiles simple walk of faith, and therefore finding of righteousness, with Israel’s fixation on rules, which do not make anyone righteous. Chapter 10 is the culmination of Paul’s demolition of the competing Jewish “authorities” attack on his gospel and attempt to bring the Roman believers under their sway to follow the rules of Judaism. These “authorities” claim following rules, the law, is the path to righteousness. In this chapter, Paul culminates his argument that their claim is exactly the opposite of what is true, and as usual Paul uses Scripture (in this case the very words of Moses) to make his case.