Know the enemy and know yourself; in a hundred battles you will never be defeated.

知彼知己,百戰不殆;不知彼而知己,一勝一負

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Original Citation

Sun Tzu. 孫子兵法 [The Art of War]. c. 475 BC, ch. 3.

Current Citation

Sun Tzu. The Art of War: The Essential Translation of the Classic Book of Life, translated by John Minford. Penguin Classics, 2009, ch. 3.