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Sun Tzu: If you know the enemy and know yourself, you need not fear the result of a…

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.
Sun TzuSourced
Source
From the book The Art of War, Chapter III, Attack by Stratagem; translated by Lionel Giles, 1910
Also quoted as
Also quoted as “If you know the enemy and know yourself, you need not fear the result of a hundred battles.”

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