Romans 2:12-15

12For as many as have sinned without the law shall also perish without the law: and as many as have sinned under the law shall be judged by the law;

13for not the hearers of the law are just before God, but the doers of the law shall be justified;

14(for when Gentiles that have not the law do by nature the things of the law, these, not having the law, are the law unto themselves;

15in that they show the work of the law written in their hearts, their conscience bearing witness therewith, and their thoughts one with another accusing or else excusing them);