Adam Clarke on Romans 2:12

For as many as have sinned without law, etc. - They, viz. the Gentiles, who shall be found to have transgressed against the mere light of nature, or rather, that true light that lighteth every man that cometh into the world, Joh 1:9, shall not come under the same rule with those, the Jews, who have in addition to this enjoyed an extraordinary revelation; but they shall be dealt with according to the inferior dispensation, under which they lived: while those, the Jews, who have sinned against the law - the positive Divine revelation granted to them, shall be judged by that law, and punished proportionably to the abuse of such an extraordinary advantage.