“Nothing perishes in this world; but things merely vary and change their form. To be born, means simply that a thing begins to be something different from what it was before; and dying, is ceasing to be the same thing. Yet, although nothing retains long the same image, the sum of the whole remains constant.”

Pitágoras de Samos (aprox. 570 - 495 a. n. e.), filósofo griego, citado por Ovidio (43 a. n. e. - 17), poeta romano, en Las Metamorfosis, libro 15. Cita extraída de: Charles Lyell (1797 - 1875), geólogo y abogado británico, en Principles of Geology.

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