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Robert A. Heinlein: Don't ever become a pessimist … a pessimist is correct oftener than an…

Don't ever become a pessimist … a pessimist is correct oftener than an optimist, but an optimist has more fun, and neither can stop the march of events.
Robert A. HeinleinSourced
Source
From the book Time Enough for Love, in Time Enough for Love (1973)

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