If you know the enemy and know yourself, you need not fear the result of a hundred battles.
知彼知己、百戦不殆。

Military Strategists
Sun Tzu
A 5th-century BCE Chinese military theorist whose treatise 'The Art of War' remains the most influential work on strategy ever written. His principles of deception, intelligence, and winning without fighting transcend warfare and have been adopted across business, diplomacy, and competitive strategy worldwide.
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Sun Tzu's Other Quotes
Related Quotes
He who plans more, wins. He who plans less, loses.
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Know your station and know sufficiency.
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One gun that hits with every shot can match a hundred guns that hit one in a hundred.
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Hard pounding this, gentlemen; let's see who will pound longest.
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Sweat saves blood, blood saves lives, and brains save both.
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