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.
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"Be subtle! be subtle! and use your spies for every kind of business."
"Move swift as the Wind and closely-formed as the Wood. Attack like the Fire and be still as the Mountain."
"Never venture on a campaign until you have made your preparations in every respect."
"If you are strong, appear weak. If you are weak, appear strong."
"The ultimate in flexibility consists in coming to rest at the precise moment when the enemy is taken by surprise."
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