"I think, therefore I suffer," or when thinking too much is harmful. This is the leitmotif of the book. According to the author, this is a real pandemic that happened in the modern world. The belief that rational reasoning can solve all questions and manage your life leads to the fact that excessive reflection is able to create problems for a person that he is not able to cope with himself. The reader will get acquainted with various types of doubts that overcome a person in different life situations, and using the example of clinical cases, the author introduces readers to his methodology for using therapeutic doubt, which helps to cope with emerging difficulties. The innovative approach of J. Nardone, known as Short-Term Strategic Therapy, allows you to see how the most complex mental problems can be solved with simple but effective solutions.