While there are many different books that discuss the spiritual aspect of life, the one that has quickly risen to the top of the bestseller list is A New Earth written by Eckhart Tolle. Since the book was promoted by Oprah’s book club in 2008, the 2005 book and audio-book was reissued and rose to the top in number of sales.

Excerpt from: 
The Spiritual Teacher, Eckhart Tolle, Has Written Many Life Changing Books