“Those that know, do. Those that understand, teach.”
More from Aristotle
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“It is the mark of an educated mind to be able to entertain a thought without accepting it.”
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“He who hath many friends hath none.”
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“Moral excellence comes about as a result of habit. We become just by doing just acts, temperate by doing temperate acts, brave by doing brave acts.”
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“Happiness depends upon ourselves.”
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“Wishing to be friends is quick work, but friendship is a slow ripening fruit.”