There are only two people who can tell you the truth about yourself - an enemy who has lost his temper and a friend who loves you dearly.
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About Antisthenes
Antisthenes was Greek philosopher, founder of cynicism (c.446–c.366 bce). Antisthenes was a Greek philosopher and a pupil of Socrates. Antisthenes first learned rhetoric under Gorgias before becoming an ardent disciple of Socrates. Read more on Wikipedia →