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Existentialism
Existence precedes essence: there is no script — every choice you make is writing the definition of what a human being is.
Existentialism was a general strike against system-philosophy. Kierkegaard fired first: Hegel’s "whole" contains no anxious, choosing, concrete me. Heidegger dug to the ontological floor — the human being is thrown into the world, a being-toward-death. Sartre supplied the famous formula, existence precedes essence, with its terrifying corollary: condemned to be free, every excuse is bad faith. Beauvoir turned the same analysis onto gender — one is not born, but rather becomes, a woman. Camus declined membership and asked the only question he thought mattered: the world being absurd, why not suicide? His answer was Sisyphus — the struggle up the slope is itself enough to fill a heart.