The only way to do great work is to love what you do.

粒子的概念只是近似的，并且只有在动量较小的极限下才有意义。

The unsaid things are often the most important.

The world is full of obvious things which nobody by any chance ever observes.

Critical comments by students should be taken in a friendly spirit， accumulation of material should not stifle the student’s independence.

语言是我们对抗不公的最强大武器。

在我们这个发人深省的时代，最发人深省的是我们仍然没有思考。