"The words we use are like the clothes we wear. They can make us look smart or silly, kind or cruel, strong or weak."

临终前与诸同志谈话，1925年3月11日

你必须能够在犯错时承认并继续前进。

The task of psychology is to reduce complex mental phenomena to their simplest components.

I believe in the discipline of mastering the best that other people have ever figured out.