Your most unhappy customers are your greatest source of learning.

我不相信运气，我相信努力工作。

It's not worth doing something unless someone, somewhere, would much rather you weren't doing it.

Inflation is a very simple idea, but it explains a lot of things.

网球是一项残酷的运动。没有平局。如果你输了，你就出局了。你必须准备好接受这一点。