"There must be a technique for meeting pain. There must be a technique of endurance based on the power of the soul to maintain its own serenity, as Marcus Aurelius taught long ago."

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The top fighters spar hard. They're really sparring for two reasons: One is to improve their technique, but the other, which is just as important, is to build endurance, toughness, and courage. They want to practice as realistically as possible so that when they go into a real fight, the transition isn't as jarring.

— Jonathan Gottschall