"Beware of false knowledge; it is more dangerous than ignorance."
"We learn from history that we learn nothing from history."
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Source: Man and Superman Maxims for Revolutionists (1903). A further extension appears in Jacob M. Braude, Speaker's Encyclopedia of Stories, Quotations, and Anecdotes (1955): Those who can, do; those who can't teach; and those who can't do anything at all, teach the teachers.
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More quotes by George Bernard Shaw
"We don't stop playing because we grow old; we grow old because we stop playing."
"I learned long ago, never to wrestle with a pig. You get dirty, and besides, the pig likes it."
"Life isn't about finding yourself. Life is about creating yourself."
"People who say it cannot be done should not interrupt those who are doing it."
"A life spent making mistakes is not only more honorable, but more useful than a life spent doing nothing."