Romans 1:13-15

I want you to know, brothers and sisters, that I have often intended to come to you (but thus far have been prevented), in order that I may reap some harvest among you as I have among the rest of the Gentiles. I am a debtor both to Greeks and to barbarians, both to the wise and to the foolish — hence my eagerness to proclaim the gospel to you also who are in Rome.

Romans 2:12-16

All who have sinned apart from the law will also perish apart from the law, and all who have sinned under the law will be judged by the law. For it is not the hearers of the law who are righteous in God’s sight, but the doers of the law who will be justified. When Gentiles, who do not possess the law, do instinctively what the law requires, these, though not having the law, are a law to themselves. They show that what the law requires is written on their hearts, to which their own conscience also bears witness; and their conflicting thoughts will accuse or perhaps excuse them on the day when, according to my gospel, God, through Jesus Christ, will judge the secret thoughts of all.