Greetings and Hi to everyone...
This is a great book because it has teachings that help you on your daily practice of the martial art you are learning.
I always look for a teaching to ponder upon before starting to train or before combat practice at the dojo or in a competition.
This book makes you understand that a martial art is not a sport. Although this is the way it is considered now a days.
In addition I recomend the following:
"The Zen Way To The Martial Arts" by Taisen Deshimaru. This book explains in detail why you must practice Zen meditation along with your martial art.
And "Zen In The Martial Arts" by Joe Hyams. This book explains how Zen helps get the mental discipline to control your daily life and also develop your physical expertise. Check out my review on this particular book, there I give a great tip on meditation practice.
This is probably one of the most amazing books I've ever read. But don'e be fooled by the editorial review, it has nothing to do with the art of war. Written by someone completely different for a completely different reason, anyone who buys it looking for another Art of War will be sorely disappointed, as the person from Mass. was. If you are looking for a book about harmony, this is it. If you practice Aikido, this book is essential. Not only does it describe the way one should preform Aikido, it also shares deep insight into how to live in harmony with everything around you.