And do you know what "the world" is to me? Shall I show it to you in my mirror? This world: a monster of energy, without beginning, without end; a firm, iron magnitude of force that does not grow bigger or smaller, that does not expend itself but only transforms itself; as a whole, of unalterable size, a household without expenses or losses, but likewise without increase or income; enclosed by "nothingness" as by a boundary; not something blurry or wasted, not something endlessly extended, but set in a definite space as a definite force, and not a space that might be "empty" here or there, but rather a force throughout, as a play of forces and waves of forces, at the same time one and many, increasing here and at the same time decreasing there.

Friedrich Nietzsche: Thus Spoke Zarathustra: A Book for All and None (1883)

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