Thus the ancient traditions of magic continued to live in the Christian Orient after the fall of paganism. They even outlived the domination of the church. The rigorous principles of its monotheism notwithstanding, Islam became infected with those Persian superstitions. In the Occident the evil art resisted persecution and anathemas with the same obstinacy as in the Orient. It remained alive in Rome all through the fifth century,[82] and when scientific astrology in Europe went down with science itself, the old Mazdean dualism continued to manifest itself, during the entire Middle Ages in the ceremonies of the black mass and the worshiping of Satan, until the dawn of the modern era. * * * * * Twin sisters, born of the superstitions of the learned Orient, magic and astrology always remained the hybrid daughters of sacerdotal culture. Their existence {194} was governed by two contrary principles, reason and faith, and they never ceased to fluctuate between these two poles of thought. Both were inspired by a belief in universal sympathy, according to which occult and powerful relations exist between human beings and dead objects, all possessing a mysterious life. The doctrine of sidereal influences, combined with a knowledge of the immutability of the celestial revolutions, caused astrology to formulate the first theory of absolute fatalism, whose decrees might be known beforehand. But, besides this rigorous determinism, it retained its childhood faith in the divine stars, whose favor could be secured and malignity avoided through worship. In astrology the experimental method was reduced to the completing of prognostics based on the supposed character of the stellar gods. Magic also remained half empirical and half religious. Like our physics, it was based on observation, it proclaimed the constancy of the laws of nature, and sought to conquer the latent energies of the material world in order to bring them under the dominion of man's will. But at the same time it recognized, in the powers that it claimed to conquer, spirits or demons whose protection might be obtained, whose ill-will might be appeased, or whose savage hostility might be unchained by means of immolations and incantations.