——回答清华学生“国民党施行的，是否俄国的主义？”，1924年2月9日

"Every book is a conversation between the writer and the reader."

I believe that love is the most important thing in the world, and music is the best way to express it.

数学的本质不是把简单的事情复杂化，而是把复杂的事情简单化。

The success of an enterprise cannot be achieved without a deep understanding of the market and respect for consumers.