世界是一本书，我们都是它的读者和作者。

The goal of mathematics is to make the simple complicated, and the complicated simple.

The key to building a successful business is to focus on creating value for your customers.

"Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors, and the most patient of teachers."

I made my money by selling too soon.

Beauty is the only thing that can save us, but it is also the most fragile.