More than 90% of the population is a slave to their thoughts. With this book, backed by eight decades of experience, I aim to transform that negative habit into something positive and enable most people to become the true masters of their minds. The title of this work may seem too blunt, but I am convinced that change is not achieved through external orders or weak impositions, but through firm internal discipline. Many people die without discovering their emotional intelligence, and in this work we seek to help you discover it, use it, and master it. Discover the life you deserve by becoming the master of your mind.