Romans is my favorite. For this reason:
“Where then is boasting?
It is excluded.
By what kind of law? Of works?
No, but by a law of faith. For we maintain that a man is justified by faith apart from works of the Law.
Or is God the God of Jews only? Is He not the God of Gentiles also?
Yes, of Gentiles also, since indeed God who will justify the circumcised by faith and the uncircumcised through faith is one.
Do we then nullify the Law through faith?
May it never be! On the contrary, we establish the Law.”
“Because by the works of the Law no flesh will be justified in His sight; for through the Law comes the knowledge of sin.”