The belief was widely spread that the spirits of the dead went to inhabit the moon. In the East this faith retained a very crude form which certainly went back to a most primitive paganism. We find it in India as well as in Manicheism, which arose in Mesopotamia in the third century, but which admitted many ancient traditions into its doctrine. “All who leave the earth,” says an Upanishad, “go to the moon, which is swollen by their breath during the first half of the month.” The Manicheans similarly affirmed that when the moon was in the crescent its circumference was swelled by souls, conceived as luminous, which it drew up from the earth, and that when it was waning it transferred these souls to the sun. Using an idea much earlier than his time,[[223]] Mani also stated that the boat of the moon, which plied in the sky, received a load of souls which every month it transferred to the sun’s larger vessel. The association established in Syro-Punic religions between the moon and the idea of immortality is marked by the abundance in Africa of funeral monuments bearing the symbol of the crescent, either alone or associated with the circle of the sun and the star of Venus.[[224]] These astral symbols are identical with those already used by the Babylonians. But it is not only among the Semitic peoples that we find the crescent on tombs, either alone or accompanied by other figures: it is of frequent occurrence, notably in Celtic countries. Possibly the Druids placed in the moon the other world where men pursued an existence uninterrupted by death.
As for the sun, the idea most commonly accepted was that the dead accompanied him on his course and went down with him in the west to an underground world. There, during the night, this enfeebled heavenly body recovered his strength, and there the dead too were revived. The power of this faith in ancient Egypt is known: the souls embarked on the boat of Ra, and with him, after they had accomplished the circle of the heavens, went down through a crevice of the earth or beyond the ocean. This was the first origin of the rôle of “psychopomp” which we shall find attributed to the solar god.
Finally many peoples believed that souls, after plying through air and space, inhabited the sky in the form of brilliant stars. The multitude of the stars scintillating in the firmament was that of the innumerable spirits who had left the world. They pressed in a dense crowd, especially in the long luminous track of the Milky Way, which was, par excellence, the dwelling of the dead. Other traditions saw in this band across the sky the highroad which the dead travelled to gain the summit of the world.[[225]] A vestige of this ingenuous conception is retained in the very name, “Milky Way.”
These ideas as to the lot of the soul after death, which were spread among a number of different peoples, may also have existed in primitive Greece but we have no proof that they were current there. As the Hellenes granted to the stars only a restricted and secondary place in their anthropomorphic religion, so in early times they had no belief, or scarcely any, in the ascent of souls to the starry sky. This doctrine was entirely strange even to the earliest Ionian thinkers. Recent research has made it more and more probable that these conceptions were introduced into Greece from the East, where astrolatry was predominant.[[226]] Pausanias[[227]] claimed to know that the Chaldeans and the Magi of India were the first to assert that the human soul is immortal, and that they convinced the Hellenes, and in particular Plato, of this doctrine. Such an affirmation, in this form, is certainly false, but it contains an element of truth. The tenet of astral immortality is ancient in the East: it probably took form in Babylon about the sixth century, when Persian Mazdeism, which believed that the righteous were lifted up to the luminous dwelling of the gods, came into contact with the sidereal religion of the Chaldeans. It was propagated in Greece especially by the Pythagoreans, for whom the soul had a celestial origin, being, as we have seen (p. 24), a fiery principle, a particle of the ether which lights the divine fires of heaven. This spark, which descended at birth in the body, which it heated and animated, reascended after death to the upper regions, whence it had come forth. Aristophanes in his Peace[[228]] greets the apparition of a new star, that of the Pythagorean poet, Ion of Chios, who had recently died, asking ironically if it be not true that “when someone dies he becomes like the stars in the air.” This is the most ancient precisely dated mention of stellar immortality (421 B. C.), and it cannot be doubted that the doctrine was that of Ion himself. Plato received it from the Pythagoreans and makes very clear allusions to it.
The fundamental idea on which it rests, the idea that the psychic essence is the same as the fire of the heavenly bodies, is at the root of all oriental astrology, which claims to explain by astral influence the formation of character. This idea of a relationship (συγγένεια) between the soul and the stars does not in Greece belong to the old basic popular beliefs. It was introduced thither by the philosophers, who, as we shall see, drew from it very important theological conclusions. According to them, it was owing to this identity of nature that the soul was capable of knowing the gods and of aspiring to join them.[[229]] This doctrine took on new power when astrology succeeded in imposing itself on the Alexandrian world, and it is significant that we find it clearly formulated by an adept of this pseudo-science, the famous Hipparchus, in the second century before our era. “Hipparchus,” says Pliny,[[230]] “will never receive all the praise he deserves, since no one has better established the relation between man and the stars, or shown more clearly that our souls are particles of the heavenly fire.” Pythagorism and Stoicism, and after them the Syrian and Persian mysteries, were to popularise this conception throughout the ancient world. In certain regions, as in Gaul, it undoubtedly found pre-existing native beliefs with which it combined, and in religion and among theologians it assumed multiple forms. We shall try to distinguish its chief aspects, dealing successively with lunar, solar and stellar immortality.
The Pythagoreans, perhaps transforming a belief of the Greek people as to Selene’s rôle, but more probably inspired by Oriental speculations, held that souls, when they had been purified by air, went to dwell in the moon. To the question, “What are the Isles of the Blessed?” the orthodox doctrine of the sect answered, “The sun and the moon.”[[231]] For them the heavenly bodies were moving islands washed by a luminous fluid, which their swift motion caused to sound about them. These thinkers, who debated all the scientific hypotheses, accepted the plurality of worlds. The heavenly bodies were other earths surrounded by air and rolling in the boundless ether. The moon in particular was designated as the “ethereal” or “Olympic earth,” and in the moon lay the Elysian Fields, the meadows of Hades, in which the shades of the heroes rested. Pythagoras himself, promoted to the rank of an immortal spirit, rejoiced there among the sages. Persephone, assimilated to Artemis, reigned over this kingdom. Did not the moon, like her, transfer itself alternately above and below the earth? The planets were this huntress’s hounds which, ever in chase, were scouring the fields of space around her in every direction.
The authors of Pythagorean apocalypses peopled the mountains and valleys of the moon with fantastic animals, stronger than ours, and with strange plants, more vigorous than those of our globe. The inhabitants of the moon, fed on the vapours of the atmosphere, were not liable to human needs. In his “True Histories,” Lucian[[232]] parodied these mad imaginings with comic exaggeration and ludicrous obscenity.
A curious fragment of Castor of Rhodes gives an instance of an unexpected application of these beliefs.[[233]] This historian, who lived at the end of the Republic, had the idea of interpreting Roman customs by the Pythagorean doctrines which Nigidius Figulus and his circle of theosophists had brought back into fashion (p. 22). In particular he explained by this method the ivory lunulae (crescents) which decorated the senators’ shoes. They recalled, he says, that noble souls inhabited the moon after death and trod on its soil.