(For other uses, see Eternity (disambiguation).)("Sempiternal" redirects here. For the album by Bring Me the Horizon, see Sempiternal (album).)\nEternity in common parlance is either an infinite or an indeterminately long period of time. In classical philosophy, however, eternity is defined as what exists outside time while sempiternity is the concept that corresponds to the colloquial definition of eternity. Eternity is an important concept in many religions, where the God or the gods are said to endure eternally. Some, such as Aristotle, would say the same about the natural cosmos in regard to both past and future eternal duration, and like the eternal Platonic forms, immutability was considered essential.

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