“I would say about 80 to 90 percent of people's thinking is not only repetitive and useless, but because of its dysfunction and often negative nature, much of it is also harmful. Observe your mind and you will know this to be true. It causes a serious leakage of vital energy.”

German-born spiritual teacher and author of the 1990s and 2000s, Eckhart Tolle is best known for his work on mindfulness and presence, particularly through his bestselling book *The Power of Now*. His teachings blend Eastern philosophy with Western psychology, emphasizing the end of suffering through awareness.