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A fool cannot be protected from his folly. If you attempt to do so, you will not only arouse his animosity but also you will be attempting to deprive him of whatever benefit he is capable of deriving from experience. Never attempt to teach a pig to sing; it wastes your time and annoys the pig.
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Robert A. Heinlein

United States writer of science fiction (1907-1988)

All Robert A. Heinlein quotes | Robert A. Heinlein Books

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"Robert A. Heinlein Quotes." Quotes.net. STANDS4 LLC, 2015. Web. 25 Nov. 2015. <http://www.quotes.net/quote/40660>.

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