I enjoy some thought provoking books on martial arts, philosphy and culture. I like your selections and agree with your assessments. I would say that those two books and the one's below are good to return to at different stages of training and life experience for fresh and new appreciation. Considering your background may I suggest four books that each quite different, but I have found useful. Zen and the Japaneses Culture by D T Suzuki A little academic, but comprehensive with good quotes and stories. The Book of the Samurai: Hagakure byYamamoto Tsunetomo (translated by William Scott Wilson) Provides some interesting insights. The Martial Spirit: an introduction to the origin, philosphy and psychology of the marital arts. by Heraman Kauz The author shares his journey in the martial arts and his motivations along the way. His conclusion may not be the same as you or I, but it has it's insights and interesting introspections. Zen in the Art of Archery by Eugen Herrigel Very esoteric and lends itself to the spiritual journey of zen and martial arts well. I believe there is an intoduction by D T Suzuki too. Considering your Kobudo background I am sure you have come across these, but I enjoy recommending them because they have been significant books to me at times. Good reading.

Tao of Jeet Kune Do by Bruce Lee He was so far ahead of his time