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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About Diogenes
Diogenes was philosopher creator of cynicism. Diogenes the Cynic, also known as Diogenes of Sinope, was an ancient Greek philosopher during the period of Classical Greece, and one of the founders of Cynicism. Read more on Wikipedia →