The task of psychology is to discover the laws of mental structure.

Life is a constant struggle between being an individual and being a member of the community.

——《在广州岭南学生欢迎会的演说》（1923年12月21日）

We must balance the need for energy security with the imperative of reducing emissions.

I choose a block of marble and chop off whatever I don't need.

我不追求名利，只追求内心的满足。

At the close of our studies， we knew all the past of physics， but nothing of the present and the future.