What philosophies were the samurai influenced by?
The philosophies of Buddhism and Zen, and to a lesser extent Confucianism and Shinto, influenced the samurai culture. Zen meditation became an important teaching due to it offering 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 realizing how fruitless their killings were. Some were killed as they came to terms with these realizations 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.
Buddhism provides many opportunities for comparative study with a diverse range of subjects. For example, Buddhism's emphasis on the Middle way not only provides a unique guideline for ethics but has also allowed Buddhism to peacefully coexist with various differing beliefs, customs and institutions in countries where it has resided throughout its history. Also, its moral and spiritual parallels with other systems of thought—for example, with various tenets of Christianity—have been subjects of close study. In addition, the Buddhist concept of dependent origination has been compared to modern scientific thought, as well as Western metaphysics.