This is an extraordinary book that was recommended to me by a longtime teacher of Aikido; it's highly respected by other teachers I know who have made Aikido their life's focus for many, many years. The preface, by Moriteru Ueshiba, the son of Morihei Ueshiba, explains that this is a translation of lectures that present the inner teachings of Aikido, describing the core of the Founder's spirit and interpretation of the techniques. He says he would be very happy if those who engage in heartfelt Aikido training make this book of the Founder's lessons their daily companion and study his words often. Again - this is a translation, not an interpretation, of profound thinking. John Stevens, the translator, is a Buddhist priest, teacher of Eastern philosophy, and a high ranking Aikido teacher in Japan. He says in the book, "All serious students of Aikido must study Morihei's words and make their own interpretation of his marvelous philosophy of the Art of Peace." He added only minimal explanations in brackets, so it's quite clear that those few touches are his own - for example, the kind of thing he adds in brackets is illustrated here: "Unification of mind and body will lead to the development of fundamental techniques. Techniques that are created by the nen [single-minded concentration, direct perception of the truth] are unlimited in scope. Techniques must reflect universal principles. For this we need true nen." I would really encourage you to use the Amazon feature that lets you "look inside" and see for yourself what it's like - It's a beautiful book worth keeping out and referring to often.