“Know thy self, know thy enemy. A thousand battles, a thousand victories.”
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Other Sun Tzu Quotes
For to win one hundred victories in one hundred battles is not the acme of skill. To subdue the enemy without fighting is the acme of skill.
Sun Tzu 
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Supreme excellence consists in breaking the enemy's resistance without fighting.
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Know your enemy and know yourself and you can fight a hundred battles without disaster.
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