Hi all, just thought I'd add a few books to the very interesting list that you already have. They are in no particular order.
1: The Celestine Prophecy - James Redfield - Actually an adventure novel, but it tackles some fundamental spiritual questions and provides truly astonishing insights.
2: The Art of Peace - Morihei Ueshiba, Translated by John Stevens - Quotations from the founder, gives great insights into the deeper spiritual aspects of Aikido.
3: The Tenth Insight - James Redfield - Another adventure novel that takes what is learnt in the Celestine Prophecy to an even higher spiritual level, dealing with one's purpose in life and how to achieve it.
4: The Secrets of Aikido - John Stevens - An in depth look at the inner elements of Aikido and a guide to using Aikido as a complement to many one's own spiritual growth.
5: The Imitation of Christ - Thomas A. Kempis et al - In my view it's like the Art of Peace, but from the Christian perspective -it's a collection of sayings/teachings and meditations from the bible and gives an idea of Christ's intentions as to how mankind should live as spiritual beings going through a physical experience.
My 2 bits.
L.C.