The biggest risk is not taking any risk. In a world that's changing quickly, the only strategy that is guaranteed to fail is not taking risks.

The truth is a trap: you cannot get it without it getting you; you cannot get the truth by capturing it, only by its capturing you.

Excellence is not an act, but a habit.

The only way to avoid being miserable is not to have enough leisure to wonder whether you are happy or not.

教师必须为形成较好人类而献出一切。