'Can you tell me what were the exact tenets of the worshippers of Isis?' 'Neither I nor any man,—with scientific certainty. As you know, she had a brother; the cult of Osiris and Isis was one and the same. What, precisely, were its dogmas, or its practices, or anything about it, none, now, can tell. The Papyri, hieroglyphics, and so on, which remain are very far from being exhaustive, and our knowledge of those which do remain, is still less so.'
