Thus the sum of things is ever being reviewed, and mortals dependent one upon another. Some nations increase, others diminish, and in a short space the generations of living creatures are changed and like runners pass on the torch of life.
LucretiusMany animals even now spring out of the soil, Coalescing from the rains and the heat of the sun. Small wonder, then, if more and bigger creatures, Full-formed, arose from the new young earth and sky. The breed, for instance, of the dappled birds Shucked off their eggshells in the springtime, as Crickets in summer will slip their slight cocoons All by themselves, and search for food and life. Earth gave you, then, the first of mortal kinds, For all the fields were soaked with warmth and moisture.
LucretiusWhy shed tears that you must die? For if your past life has been one of enjoyment, and if all your pleasures have not passed through your mind, as through a sieve, and vanished, leaving not a rack behind, why then do you not, like a thankful guest, rise cheerfully from life's feast, and with a quiet mind go take your rest.
Lucretius