I would recommend that any serious martial artist, beginner or Dan grade, read this book. It is also explicitly aimed at non-Martial Artists, and I can understand that someone with not the slightest interest in the arts would also find this book of immense interest and practical help.
Although Leonard Sensei speaks specifically of the art of Aikido, the philosophy that he expounds goes to the very heart of all martial arts. Do not be put off by the word "Philosophy": this book is packed with down to earth explanations, examples, and practical suggestions. I found that it was impossible to put it down, and keep returning to it. Like all great books, there is something more to be learnt each time that you return.
I find it hard to believe that there is anyone with an open mind who could fail to learn something from this eminent taecher.