When you are young, you think that the world is a place where you can live as you choose. But as you get older, you realize that the world is a place where you have to live as you must.

心理学的任务是分析给定的事物。

The older one grows, the more one likes indecency.

——〈在香港大学的演说〉，1923年2月19日

真正的英雄是那些即使害怕也坚持战斗的人。

我们必须承认自己的错误并从中吸取教训。