Chapter 3 ends on the note saying that it is the law of faith that enables us to fulfill the law and Chapter 4 encompasses GRACE. So far, Paul has pointed out the fact that salvation is by faith and faith alone, he talks about the ungodly nature of men who have chosen to have reprobate minds and how God has given them up to their reprobate minds. In Chapter 3, we see Paul talk of 2 categories of people; the Jews and the Gentiles. The Jews were the people whom God had given the laws and told His promise, for this they felt like a special kind of people, judging others and being hypocritical. The second set of people, the Gentiles, were the ones who did not know or serve God and were regarded as outsiders and not God’s people. But Paul tells us that all the people, Jew or non-Jew had all fallen short of the glory of God, none was good and all needed saving. And this salvation could only come through faith and not works. In Chapter 4, he uses 2 examples to support his statement, Abraham and David.