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1. The Power of Now

by Eckhart Tolle

2. The Untethered Soul

by Michael Singer

3. The Four Agreements

by Don Miguel Ruiz

4. The Seven Spiritual Laws of Success

by Deepak Chopra and Wayne W. Dyer, M.D. (another great one!)

5. Tao Te Ching (actually, any translation will do)

6. The Alchemist

7. One Reality by Adyashanti and some other book that I can't remember but is about the same stuff as One Reality

8. What is Mind

by Gary Weber, Phd
and David Rynick, Phd

9. Note from March 23, 2015

the other book I was thinking of is "The Book of Secrets" by Andrew Cohen which is a compilation of various spiritual teachers from around the world describing their version of spirituality

AI James Altucher