顾客可能不总是对的，但他们永远是顾客。

The process of doing mathematics is more important than the result.

What is the one sentence summary of how you change the world? Always work hard on something uncomfortably exciting!

The hardest thing in life is to know which bridge to cross and which to burn.

书籍是一种政治行动。书籍是知识。书籍是反思。书籍改变你的思想。