It was under the bodhi tree in India twenty-five centuries ago that Buddha achieved the insight that three states of mind were the source of all our unhappiness: wrong knowing, obsessive desire, and anger. All are difficult, but in one instant of anger-one of the most powerful emotions-lives can be ruined, and health and spiritual development can be destroyed. With exquisite simplicity, Buddhist monk and Vietnam refugee Thich Nhat Hanh gives tools...