Hagakure is the essential book of the Samurai. Written by Yamamoto Tsunetomo... These philosophies are centered on loyalty, devotion, purity and selflessness, and Yamamoto places a strong emphasis on the notion of living in the present moment with a strong and clear mind.
Hagakure Link: http://3yryua3n3eu3i4gih2iopzph.wpengine.netdna-cdn.com/wp-content/uploads/2016/07/pdf/hagakure.pdf
