A contemporary phenomenon, and perhaps the most popular of pagan cults in the third and fourth centuries, was the worship of Mithra, around which Neo-Platonism could throw its cloak as well as around any other form of pagan worship. Mithraism, a partially Hellenized growth from the old Mazdaean (even Indo-Iranian) faith, had been carried from one boundary of the Empire to the other, by soldiers or by merchants who had imbibed its doctrines in the East. It shot over the Empire like a flame. A warrior cult, the late pagan emperors gave it their adhesion. It was, in fine, the pagan Antaeus destined to succumb in the grasp of the Christian Hercules. With it, or after it, came Manicheism, also from the East. This was quite as good a philosophy as the Neo-Platonism of Iamblicus. The system called after Manes was a crass dualism, containing fantastic and largely borrowed speculation as to the world and man. Satan was there and all his devils. He was the begetter of mankind, in Adam. But Satan himself, in previous struggles with good angels, had gained some elements of light; and these passed into Adam’s nature. Eve, however, is sensuality. After man’s engendering, the strife begins between the good and evil spirits to control his lot. In ethics, of course, Manicheism was dualistic and ascetic, like Neo-Platonism, and also like the Christianity of the Eastern and Western Empire. Manicheism, unlike Mithraism, was not to succumb, but merely to retreat before Christianity. Again and again from the East, through the lower confines of the present Russia, through Hungary, it made advance. The Bogomiles were its children; likewise the Cathari in the north of Italy, and the Albigenses of Provence.[45] Platonism, Stoicism, Neo-Platonism, Mithraism, and Manicheism, these names, taken for simplicity’s sake, serve to indicate the mind and temper of the educated world in which Christianity was spreading. Obviously the Christian Fathers’ ways of thinking were given by all that made up their environment, their education, their second natures. They were men of their period, and as Christians their intellectual standards did not rise nor their understanding of fact alter, although their approvals and disapprovals might be changed. Their natures might be stimulated and uplifted by the Faith and its polemic ardours, and yet their manner of approaching and apprehending facts, _its_ facts, for example, might continue substantially those of their pagan contemporaries or predecessors.