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Audiobook The Art of War - The Use of Spies
The Use of Spies - Aim of spying in all its five varieties is used for the knowledge of the enemy. "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.