The Greek Sophists Quotes

“God left all men free; Nature has made no man a slave.’ (Anonymous, in Rhetorica Aristotelis, CAG XXI: 2, p. 74 Rabe) This, remarkably, is the only surviving testimony to what must have been a fairly widespread sophistic thesis, that slavery is contrary to nature (referred to disapprovingly by Aristotle at Politics 1253b20ff.).”
― John M. Dillon, The Greek Sophists