All who sin apart from the law will also perish apart from the law, and all who sin under the law will be judged by the law. For it is not those who hear the law who are righteous in God’s sight, but it is those who obey the law who will be declared righteous. (Indeed, when Gentiles, who do not have the law, do by nature things required by the law, they are a law for themselves, even though they do not have the law. They show that the requirements of the law are written on their hearts, their consciences also bearing witness, and their thoughts sometimes accusing them and at other times even defending them.) This will take place on the day when God judges people’s secrets through Jesus Christ, as my gospel declares. Romans 2:12-16
Jews and Gentiles alike know the truth because the “requirements of the law is written on their hearts.” In general we know right from wrong without formal training in legal matters. The more we sin, though, the further apart from the law we go. So we return to the phrase, “we are all without excuse.” Why? Because it’s already been written on our hearts. We may not have the details of societal laws but we do know the basics.
There is someone you can pray for who isn’t experiencing the true peace that comes from knowing Christ. The truth’s already there and he/she may not be able to articulate it but it’s there. Pray for the opportunity to share it.