 He learned theurgy from Maximus of Ephesus, a student of Iamblichus; his system bears some resemblance to the Neoplatonism of Plotinus; Polymnia Athanassiadi has brought new attention to his relations with Mithraism, although whether he was initiated into it remains debatable; and certain aspects of his thought (such as his reorganization of paganism under High Priests, and his fundamental monotheism) may show Christian influence.Some of these potential sources have not come down to us, and all of them influenced each other, which adds to the difficulties.According to one theory (that of G.W.