"Beware of false knowledge; it is more dangerous than ignorance."
"He who can, does. He who cannot, teaches."
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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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"We don't stop playing because we grow old; we grow old because we stop playing."
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