1. “Man in Search of Meaning.” Viktor Frankl.

2. “The Man who Planted Trees.” Jean Giono.

3. “Philosophical Dictionary.” André Comte-Sponville.

4. “Siddharta.” Hermann Hesse.

5. “Leaves of Grass.” Walt Whitman.

6. “The Wheel of Life.” Elisabeth Kübler-Ross

7. “Grace and Grit.” Ken Wilber.

8. “The Power of Free-Will.” Annie Marquier.

9. “The Art of Loving.” Erich Fromm.

10. “Scripts People Live.” Claude M. Steiner.

11. “I Am That.” Sri Nisargadatta Maharaj.

12. “Who Am I? The Sacred Quest.” Jean Klein.

13. “The Dance of Reality.” Alejandro Jodorowsky.

14. “The Little Prince.” Antoine de Saint-Exupéry.

15. “The Act of Will.” Roberto Assagioli.

16. “The Prayer of the Frog.” Anthony de Mello.

17. “The Wisdom of Insecurity.” Alan Watts.

18. “Integral Psychology.” Ken Wilber.

19. Bhagavad Gita.

20. I Ching.