The true teacher defends his pupils against his own personal influence. He inspires self-distrust. He guides their eyes from himself to the spirit that quickens him. He will have no disciple.

凡事要量力而行，如果用鸡蛋去碰石头，即使把世界上的鸡蛋都碰完，石头还会和原来一样，不会被损毁。