"Courage is rarely reckless or foolish... courage usually involves a highly realistic estimate of the odds that must be faced."

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By altering his arrangements and changing his plans, the skillful general keeps the enemy without definite knowledge. By shifting his camp and taking circuitous routes, he prevents the enemy from anticipating his purpose. At the critical moment, the leader of an army acts like one who has climbed up a height and then kicks away the ladder behind him.

— Sun Tzu