The article summarizes a book titled "The Gap," which addresses the psychological phenomenon of "gap"—the disparity between expectations and reality that often leads to negative emotions. Authored by French psychological expert Michel Lejoyeux, the book proposes that most negative feelings stem from this gap, and that these emotions, while common, can be managed. The text outlines three main points from the book: first, distinguishing between "true" and "false" worries, asserting that many negative emotions arise from imagined scenarios rather than objective problems; second, understanding the brain's "bell" or "push-pull" system, which suggests that emotional and rational brain functions cannot operate simultaneously, implying that engaging rational thought can suppress emotional responses; and third, offering practical tools and methods—such as thought blocking, multi-angle thinking ("doubt cross"), healthy narcissism, and a five-step problem-solving approach—to help individuals constructively deal with and overcome negative emotional states.