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As a matter of self-preservation, a man needs good friends or ardent enemies, for the former instruct him and the latter take him to task.
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an ancient Greek philosopher and Cynic who rejected social conventions (circa 400-325 BC)

All Diogenes quotes | Diogenes Books

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"Diogenes Quotes." Quotes.net. STANDS4 LLC, 2015. Web. 1 Dec. 2015. <http://www.quotes.net/quote/42731>.

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