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In page Samurai:

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The philosophies of Confucianism,[1] Buddhism and Zen, and to a lesser extent Shinto, influenced the samurai culture. Zen meditation became an important teaching because it offered a process to calm one's mind. The Buddhist concept of reincarnation and rebirth led samurai to abandon torture and needless killing, while some samurai even gave up violence altogether and became Buddhist monks after coming to believe that their killings were fruitless. Some were killed as they came to terms with these conclusions in the battlefield. The most defining role that Confucianism played in samurai philosophy was to stress the importance of the lord-retainer relationship—the loyalty that a samurai was required to show his lord.[citation needed]