A modern German Advaita master and teacher, Eckhart Tolle (1948- ) emphasizes not being caught up in thoughts of past and future as a way of being aware of the present moment, subjects he explored in his nonfiction bestseller, The Power of Now. His later book, A New Earth, further explores the structure of the human ego and how this acts to distract people from their present experience of the world. He asserts that it is the feeding of the human ego that is the source of inner and outer conflict, and that only by examining the ego may spiritual aspirants begin to see beyond it and to reach a sense of spiritual awakening or a new outlook on reality.