Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The spirit of martial arts and what it means to you

My sensei had everyone in my dojo read Gichin Funakoshi's Karate-Do; My Way of Life, which spells out the principles of martial arts. This book follows the development of a martial arts master and his student, and while it doesn't spell out principles it shows them through parables. I think of it as a "companion" book to Funakoshi's, (which I think should be read first) even though the two authors did not collaborate.I found this book to be a good clarifier for personal motives and battles encountered in martial arts training and I think this is a very good choice for any martial artist. I will keep it in my collection and re-read it every few years. I also look forward to reading the sequel, "Towards the Unknown."