These verses give the sum of what Paul is going to detail in the rest of the book. Individuals are in need of good news because of their sin. The only thing that has power to free men from sin is Jesus Christ and His death on the Cross. Salvation from sin is not something that can be worked for but it can only be grasped by faith in Christ. This is the passage that changed centuries of religious beliefs that said a person had to work for salvation. When individuals figured out that the just ones live by faith, it was a message powerful enough to change the world.