I have been lucky enough to have some excellent teachers. Although I tell my own kids that even if you don't like the teacher, you have to try your best, it's definitely easier to do this when you like the teacher. One of the best teachers I had was Monsieur Tétart. I met him in October of 1989, the summer of my Junior year abroad in Aix-en-Provence, France.
Mont Sainte Victoire, by Cézanne