The Demon's Sermon on the Martial Arts is a thought-provoking Japanese feudal era book written by Issai Chozanshi. It is a collection of philosophical teachings and insights on the nature of martial arts and combat. The book explores the psychological and spiritual aspects of martial arts, emphasizing the importance of self-awareness, discipline, and the pursuit of enlightenment. It challenges conventional notions of violence and offers a deeper understanding of the true purpose of martial arts. The Demon's Sermon on the Martial Arts is a must-read for martial artists and individuals interested in the philosophical dimensions of combat.