Not only can you not step into the same river twice; it is not even the same you who can’t step into the same river twice. Everything modifies everything. There is no niche in the past waiting for him to come back and occupy it. Nature will tolerate a paradox, but she abhors a vacuum.

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Quote text and notes from Wikiquote: Robert Sheckley (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.