We Know That We Know
“When Gentiles who have not the law do by nature what the law requires, they are a law to themselves, even though they do not have the law. They show that what the law requires is written on their hearts, while their conscience also bears witness and their conflicting thoughts accuse or perhaps excuse them on that day when, according to my gospel, God judges the secrets of men by Christ Jesus.”
Paul is saying that the requirements of God’s law are written on the hearts of all people, even non-Jews who don’t have the Mosaic Law, and therefore they do by nature what the law requires. There’s a kind of common moral code that fills the world’s societies that is rooted in the conscience of man. Paul says that our conscience bears witness and tells us what to do and what not to do.
Therefore, all persons everywhere, through God’s general revelation can know that there is an eternal, powerful Creator of the world before whom we are morally responsible and, based on what Paul says in Romans 1, morally guilty and whose forgiveness we need. That can be known by anybody anywhere. That’s God’s general revelation in nature and conscience.