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If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle.
 Sun TzuThe Art of War (5th century BC). copy citation

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5th century BC
Language
English
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Translated by Lionel Giles
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