研究历史的人，贵在能够贯通古今的变化，探究天道与人事的关系。

I don't write for the reader, I write against the reader.

The modern state is characterized by its ability to concentrate and use power in a way that premodern states could not.

Mathematics is not a deductive science—that's a cliché. When you try to prove a theorem, you don't just list the hypotheses and then start to reason. What you do is trial and error, experimentation, guesswork.

最好的企业是为真实的人们解决真实的问题。

Do not be avaricious； do not be a recluse.

领先的秘诀就是开始行动。