After reading this book the first time, my understanding and comprehension of my art has greatly expanded. After reading through the second time, I was a bit disheartened about all the things I missed the first time reading. But I am confident that with each re-read that I will come to better understand the concepts and ideals set out in writing by Yagyu Munenori each time.
As I am sure most exponents of the martials arts have come across the terms, Shu, Ha, Rei. Or a similar concept. Reading this book is similar, we can read and copy the ideals verbatim in our everyday lives but it only mimicking the sensei so that our mind and body can absorb the teaching as in Shu. After gaining a better understanding we can break away (not literally) from the sensei's teachings to explore their meaning in greater depth as in Ha. Then comes the "final" stage of Rei, where we can adapt our sensei's teaching to further develop ourselves personally and make it a part of our individual style. Then we review it all and go through Shu, Ha, Rei again. As in our training this process can happen over one training session for a technique but it is a constant over the lifetime of all we do in our art. We are all training over a lifetime, it is not possible for us to learn everything in a few years.
This book is not to teach people about how to swing a sword. If that is what you are after, I think you should reconsider and get another book. This book is more about "Why should I use a sword and the ideals, responsibilities and consequences." But it goes even further than a sword, this is about how we conduct ourselves whether we be samurai, poet, or a leader.
Whether you are just beginning a new martial arts or have been training for a long time this is a good book to gain better insight as to why we train. For those that train in the Koryu Bujutsu, this is a definite must have book.
Arigato