The most important thing in mathematics is to have a good intuition.

"If you don't change, you become extinct."

To imagine is to practice freedom.

睡眠，那些小小的死亡切片——我多么厌恶它们。

Green mining and low-carbon utilization are the only way for the sustainable development of the coal industry.

——〈在东京对同志的声言〉，1915年10月25日