The only way to learn mathematics is to do mathematics.
The desire to be desired is the most powerful thing in the world.
"I write to expose myself, to understand myself."
——《在山西实业界学界及各党派欢迎会的演说》(1912年9月20日)
I don't wait for moods. You accomplish nothing if you do that. Your mind must know it has got to get down to work.