You might think that only those with the Bible have a clear understanding of right and wrong. But Paul challenges that idea, pointing to people who have never even seen the Ten Commandments.
Paul introduces a fascinating idea here: that even without the written Law given to Israel, people possess an internal sense of morality.
Doing What the Law Requires
He says that when Gentiles, who don't have the Mosaic Law, 'by nature do what the law requires,' they demonstrate an innate moral compass. This 'nature' refers to their inner being, guided by reason and conscience, not by external commands.
A Law Unto Themselves
Because of this inner guidance, Paul calls them 'a law unto themselves.' This means their own conscience and understanding function as a moral guide, directing them toward righteous actions and away from wrongdoing, much like the written Law does for those who possess it.