Many individuals become exhausted and depleted either by their jobs or by relationships they are in. It becomes more and more difficult to experience enthusiasm, pleasure, and even the will to go on. At that time many feel that a rest, break, or renewal is the best cure for this feeling. Although these can be beneficial, it's important to note that the deepest cause of burnout is unacknowledged anger, which comes from frustration and insufficient rewards.
— Brenda Shoshanna, The Anger Diet