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 everyt… - Robert Sheckley

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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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About Robert Sheckley

Robert Sheckley (July 16, 1928 – December 9, 2005) was a Hugo- and Nebula-nominated American science fiction author.

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It takes a particular kind of a man to endure the shattering immensities of space and the paranoid-inducing stresses of threats from the unknown. It takes a man with a large and impervious ego and a consistently high degree of aggressive self-confidence. It takes a kind of a nut.

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