True happiness arises, in the first place, from the enjoyment of one's self, and in the next, from the friendship and conversation of a few select companions.

在桂林学界迎会的演说，1922年1月22日

安全必须始终是我们每天每项操作的首要任务。

I am not afraid of death, I just don't want to be there when it happens.

学习在于改变介于刺激和反应之间的某些中介过程。

To understand the electron is to understand the foundation of our technological civilization.

Human cognition is best understood as a hierarchy of information processing levels.

The best teacher in life is experience.