经济理论提供工具，但现实世界的测试会完善它们。

"I don't think about being the best. I think about improving every day."

I don’t believe in failure because I don’t believe in giving up.

I'm as proud of many of the things we haven't done as the things we have done.Innovation is saying no to a thousand things.

最终，我们都只是故事。重要的是我们如何讲述它们。