Knowing others is intelligence; knowing yourself is true wisdom. Mastering others is strength; mastering yourself is true power.
Lǎozi was a Chinese philosopher (also called Lao Zi, Lao Tzu, Lao Tse, or Lao Tze), The Tao Te Ching (6th – 5th century BC), Ch. 33, as interpreted by Stephen Mitchell (1992).
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Lao Tzu
