5 stars (out of 5) for the performance and 0 stars for the message. There is a huge difference between being strict and being encouraging your students to have more perseverance and that they should give a better work through more training and between being the person who is demeaning his students and insulting them and psychologically manipulating them in the aim that he is trying to get out the best of them. Even if he gets at the end one unique, successful student, the amount of other students who have now psychological problems due to his approach cannot give him an execuse.