A music teacher during a rehearsal approaches one of his students and says: you need to dedicate more hours to your instrument, the surprised young man tells him: he is a good teacher. For several weeks he was pressuring his student, telling him that his footsteps were not perfect, that he needed more practice. When another of his students listens to him, he approaches him and says: Professor, why do you say that to our classmate if he is the most outstanding student of all? and just at that moment the teacher stares at him and a smile begins to draw on his face and he responds: Because telling him he is the best will make him believe that he does not need to continue learning.