Ego is the enemy does not depend on this specialized psychological definition, but rather means the characteristic of vanity, and focus on the self, which suddenly makes the world not accommodate our giant self, around which everything revolves around. It is also the same expression; Which scientists and psychologists deal with; Currently with the general public, we also use it a lot in our daily life. The AUTHOR of the book, Ryan Holiday; This feeling, especially when he achieved great successes at a young age, and tested the impact of vanity in the various stages of his life, so that he tattooed the phrase "vanity is the enemy" on his arm to remember this philosophy all the time. He decided to tell us; His experience summary to adapt to vanity; And tools that enable us to control it in our lives; Through smart tips, it is difficult to reject, because it is simply issued by a former arrogant colleague.