" To development belongs fulfilment — every evolution has a beginning, and every fulfilment is an end. To youth belongs age; to arising, passing; to life, death. For the animal, tied in the nature of its thinking to the present, death is known or scented as something in the future, something that does not threaten it. It only knows the fear of death in the moment of being killed. But man, whose thought is emancipated from the fetters of here and now, yesterday and tomorrow, boldly investigates the “once” of past and future, and it depends on the depth or shallowness of his nature whether he triumphs over this fear of the end or not. An old Greek legend — without which the Iliad could not have been — tells how his mother put before Achilles the choice between a long life or a short life full of deeds and fame, and how he chose the second.
Man was, and is, too shallow and cowardly to endure the fact of the mortality of everything living. He wraps it up in rose-coloured progress-optimism, he heaps upon it the flowers of literature, he crawls behind the shelter of ideals so as not to see anything. But impermanence, the birth and the passing, is the form of all that is actual — from the stars, whose destiny is for us incalculable, right down to the ephemeral concourses on our planet. The life of the individual — whether this be animal or plant or man — is as perishable as that of peoples of Cultures. Every creation is fore-doomed to decay, every thought, every discovery, every deed to oblivion. Here, there, and everywhere we are sensible of grandly fated courses of history that have vanished. Ruins of the “have-been” works of dead Cultures lie all about us. The hubris of Prometheus, who thrust his hand into the heavens in order to make the divine powers subject to man, carries with it his fall. What, then, becomes of the chatter about “undying achievements”? "
― Oswald Spengler , Man and Technics: A Contribution to a Philosophy of Life