“Man is a pupil, pain is his teacher.”
“I must try to remember that a boy's heart is not a man's, and perhaps a teacher must learn from his pupil, too, eh?”
“A good teacher protects his pupils from his own influence. ”
“The true teacher defends his pupils against his own personal influence.”
“History is an excellent teacher with few pupils.”
“Man vergibt seinem Lehrer schlecht, wenn man immer nur der Schüler bleibt. (One repays a teacher badly if one always remains nothing but a pupil.)”