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
In war, I have heard of clumsy swiftness, but never seen clever delay.
All warfare is based on deception.
In war there is no constant posture, as water has no constant form. He who can win by adapting to the enemy's changes may be called divine.
To fight and conquer in all your battles is not supreme excellence; supreme excellence consists in breaking the enemy's resistance without fighting.
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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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