The book is a hymn to work well done and perseverance despite fatigue or difficulty. The subtitle: Why Competence Matters More Than Passion to Achieve Your Dream Job. It debunks several fallacies, which are actually very non-intuitive opinions. He asserts that in the age we live in, the age of distraction, the value of those who know how to stay focused and are capable of deep reflection in professional development will increase. He advocates austerity, fortitude and sustained effort in personal progress. It is about learning to love what you do and not to do what you love. This requires accumulating the necessary skills, saying no to everything that prevents one from maintaining control of one's work and focusing on what adds value.
It provides tools to become an expert in what one already does and to achieve mastery of one's time. It is a brilliant work and the author's first to be translated into Spanish. Since its initial publication it has become a best seller. Its style is simple, easy to read, has many practical points with a mixture of common sense and motivation.