{Nature itself} (h(8820)phusis aut(885c)). He reenforces the
appeal to custom by the appeal to nature in a question that
expects the affirmative answer (oude). Phusis, from old verb
phu(935c), to produce, like our word nature (Latin _natura_), is
difficult to define. Here it means native sense of propriety (cf.
 Ro 2:14 ) in addition to mere custom, but one that rests on the
objective difference in the constitution of things.