Eternal Recurrence — Central concept in Friedrich Nietzsche’s philosophy, according to which every moment of existence repeats itself infinitely, identical in every detail, in a cycle without beginning or end. It is first formulated in the published work in The Gay Science (1882, §341, “The Greatest Weight”) as a thought experiment: imagine a demon telling you that this life, as you now live it, you will have to live once more and innumerable times more, with nothing new in it. The idea operates on distinct registers. As an existential criterion, it is the “greatest weight” that selects: only one who can wholly affirm their own life can bear to desire its eternal repetition. As cosmology, it appears in the posthumous fragments of the 1880s as the hypothesis that, in a universe finite in forces but infinite in time, all configurations eventually recur cyclically. As an ethical-selective thought, it functions as an immanent imperative — “live in such a way that you would want to live again” — replacing transcendent morality with an internal criterion of value. The theme is developed dramatically in Thus Spoke Zarathustra (1883–85), where Zarathustra falls ill on facing the thought and only later embraces it. Gilles Deleuze, in Nietzsche and Philosophy (1962), interprets eternal recurrence as a selective ontological principle: only what affirms itself returns, only the active, while the reactive and the nihilistic eliminate themselves. The concept is closely tied to amor fati (love of fate) and the will to power as components of Nietzsche’s affirmative thought.
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