"[Writing to Lucretius, on Epicurus' belief that the soul was no different from the rest of the cosmos; made of atoms] "Death is therefore nothing to us, and does not concern us at all, since it appears that the substance of the soul is perishable. When the separation of body and soul, whose union is the essence of our being, is consummated, it is clear that absolutely nothing will be able to reach us and awaken our sensibility, not even if earth mixes with sea, and sea with heaven."