Nature itself (h pusi auth). He reenforces the appeal to custom by the appeal to nature in a question that expects the affirmative answer (oude). Pusi, from old verb puw, to produce, like our word nature (Latin natura), is difficult to define. Here it means native sense of propriety (cf. Romans 2:14 ) in addition to mere custom, but one that rests on the objective difference in the constitution of things.