“The general who wins the battle makes many calculations in his temple before the battle is fought. The general who loses makes but few calculations beforehand.”
Source: The Art of War, Chapter I · Detail Assessment and Planning
Original
夫未戰而庙算胜者,得算多也;未戰而庙算不勝者,得算少也。
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Sun Tzu 68
ancient Chinese military general, strategist and philosophe… -543–-495 BCRelated quotes

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“A battle is won by him who is firmly resolved to win it.”
Source: War and Peace