It is the mark of an educated mind to be able to entertain a thought without accepting it. As in other cases, we must set out the appearances (phainomena) and run through all the puzzles regarding them. In this way we must prove the credible opinions (endoxa) about these sorts of experiences —ideally, all the credible opinions, but if not all, then most of them, those which are the most important. For if the objections are answered and the credible opinions remain, we shall have an adequate proof.

Aristotle, Greek philosopher (384-322 BC)