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• He who knows others is clever; he who knows himself is enlightened.
  -- Lao-tzu, Chinese philosopher and founder of Taoism...
• He who knows that enough is enough will always have enough. -- Lao Tsu
• He who knows, does not speak. He who speaks, does not know. -- Lao Tsu
• He who knows does not speak, He who speaks does not know. -- Lao Tzu
• He who beleives in nobody knows that he himself is not to be trusted.
• He who knows not and knows that he knows not is ignorant.
  Teach him. He who knows not and knows not that he knows not is a fool....
• A truly wise person knows that he knows not.