Quite another doctrine was propagated by the Syrian cults and the Persian mysteries of Mithras, which spread in the West in the first century of our era. These religions taught that the soul of the just man does not go below the ground but rises to the sky, there to enjoy divine bliss in the midst of the stars in the eternal light. Only the wicked were condemned to roam the earth’s surface, or were dragged by the demons into the dusky depths in which the spirit of evil reigned. Opinions differed as to the region of heaven in which the souls of the elect dwelt. The “Chaldeans,” who looked upon the sun as the master and the intelligence of the universe, made him the author of human reason, which returned to him after it had left the body, while for the priests of Mithras the spirit rose, by way of the planetary spheres, to the summit of the heavens. We will have to examine later the different forms of astral immortality.[94] But you will already have noticed how nearly this immortality, as formulated by the Iranian and Semitic sects, approximated to the doctrine taught by Pythagorism and adopted by Neo-Stoicism. This meeting of the two doctrines was not an effect of chance. The idea that souls are related to the celestial fires, whence they descend at birth and whither they reascend at death, had probably been borrowed by the ancient Pythagoreans from the astral religions of the East. Recent research seems to have established the fact of its Chaldeo-Persian origin. But the Greek philosophers, according to their wont, defined and developed this idea in an original way. In the Hellenistic period, when they adopted astrology, they were subject for the second time to the ascendancy of the scientific religion of the “Chaldeans”; and, in their turn, they reacted on the Oriental cults when these spread in the Graeco-Roman world. We have sure evidence that the mysteries of Mithras were, in particular, strongly affected by the influence of the Pythagorean sect, which was itself organised like a kind of mystery. In a more general way, philosophy introduced into the mysteries ethical ideas and, instead of the purely ritualistic or rather magical means of salvation, some moral requirements became necessary to earn immortality.