I bought this book just last month, and like so many of the Buddhist or martial arts books, I dived right into it. This book is a two-fer in that regard, as it blends Zen Buddhism with martial arts.
The book is a collection of talks given at a retreat in Switzerland in 1975 that blended zazen sitting with martial arts demonstrations. Of course, you can draw many parallels between the focus in practicing martial arts techniques and forms and the Buddhist focus not only on sitting/meditating, but also in the focus on being present in every moment and doing everything fully in the moment.
So there’s not really anything surprising in the book; I didn’t flag anything for comment.
I read these books because I find them a bit calming, but they really do go in one eye and out the other as far as remembering their contents goes.