Thinking, or more precisely identification with thinking, gives rise to and maintains the ego, which, in our Western society in particular, is out of control. It believes it is real and tries hard to maintain its supremacy. Negative states of mind, such as anger, resentment, fear, envy, and jealousy, are products of the ego.
Eckhart TolleWhenever anything negative happens to you, there is a deep lesson concealed within it, although you may not see it at the time
Eckhart TolleBefore I wrote The Power of Now, I had a vision that I had already written the book and that it was affecting the world. I had a sense there was already a book somehow in existence. I drew a circle on a piece of paper and it said "book." Then I wrote something about the effect the book had on the world, how it influenced my life and other people's lives, and how it came to be translated into many languages affecting hundreds of thousands of people.
Eckhart Tolle