But what if the shadow of incalculable possibilities should fall across this sunny retreat? What if after death we should awake in a world to which the atomic philosophy might not in the least apply? Observe that this suggestion is not in the least opposed to any of the arguments by which science might prove the atomic theory to be correct. All that Epicurus taught about the universe now before us might be perfectly true of it; but what if to-morrow a new universe should have taken its place? The suggestion is doubtless gratuitous, and no busy man will be much troubled by it; yet when the heart is empty it fills itself with such attenuated dreams. The muffled pleasures of the wise man, as Epicurus conceived him, were really a provocation to supernaturalism. They left a great void; and before long supernaturalism--we shall see it in Dante--actually rushed in to quicken the pulses of life with fresh hopes and illusions, or at least (what may seem better than nothing) with terrors and fanatical zeal. With such tendencies already afoot as the myths and dogmas of Plato had betrayed, it was imperative for Epicurus to banish anxiously all thought of what might follow death. To this end are all his arguments about the material nature of the soul and her incapacity to survive the body. To say that the soul is material has a strange and barbarous sound to modern ears. We live after Descartes, who taught the world that the essence of the soul was consciousness; and to call consciousness material would be to talk of the blackness of white. But ancient usage gave the word soul a rather different meaning. The essence of the soul was not so much to be conscious as to govern the formation of the body, to warm, move, and guide it. And if we think of the soul exclusively in this light, it will not seem a paradox, it may even seem a truism, to say that the soul must be material. For how are we to conceive that preexisting consciousness should govern the formation of the body, move, warm, or guide it? A spirit capable of such a miracle would in any case not be human, but altogether divine. The soul that Lucretius calls material should not, then, be identified with consciousness, but with the ground of consciousness, which is at the same time the cause of life in the body. This he conceives to be a swarm of very small and volatile atoms, a sort of ether, resident in all living seeds, breathed in abundantly during life and breathed out at death.