The beauty of mathematics is that it is a language that can describe the universe in a way that nothing else can.

——《在东京（民报）创刊周年庆祝大会的演说》（1906年12月2日）

We have three baskets for investing：yes，no，and too tough to understand.

"Everything is a learning process: any time you fall down, it's just teaching you to stand up the next time."

心理学必须基于可观察的事实，而非推测。