Romans 2:14

There is, indeed, when we look closely, no such thing as a man absolutely without the knowledge of God's will, and therefore such a judgment as the Apostle has described is legitimate. Gentiles, “such as have not law” in any special shape, when they do by nature “the things of the law” i.e., the things required by the law given to Israel, the only one known to the Apostle are in spite of not having law (as is the supposition here) a law to themselves. ἔθνη is not “the Gentiles,” but “Gentiles as such” persons who can be characterised as “without law”. The supposition made in τὰ μὴ νόμον ἔχοντα is that of the Jews; and the Apostle's argument is designed to show that though formally, it is not substantially true.