Including translations of Yagyu Munenori"s Book of the Sword and Takuan Soho"s Inscrutable Subtlety of Immovable Wisdom and The Peerless Sword, the teachings in this spiritual guide represent the recording and codification of these 17th-century beliefs. From its emphasis on detachment to the attempt to clear the mind and "be in the moment," the book delves into the key influence of Zen on the samurai"s combat style and way of life.