The Origins of Julian's Hellenism

Julian's Hellenism exhibits a ripe flowering of many of the key aspects of esoteric religion and philosophy that keen listeners will be very familiar with. The major schools of Greek philosophy are harmonized by julian through and appeal to a kind of perennial philosophy idea. Everything has to be read along the lines of kamblicus as a sort of master key whereby all these canonical sources of truth are to be interpreted. How do we tell the truth from the false in such a polyseamous web of cultural forms?