我不需要理由去自信。

The welfare of the farmer is the welfare of the nation.

The beauty of mathematics is that it allows us to see patterns and structures in the world that are not immediately obvious.

勇气不是没有恐惧，而是判断有比恐惧更重要的东西。

万物皆由四要素组成：地、水、火、气。

You have to be willing to take risks, and if you fail, you have to be willing to get up and try again.

I was working at a financial firm in New York City with a bunch of very smart people， and I had a brilliant boss that I much admired. I went to my boss and told him I wanted to start a company selling books on the Internet. He took me on a long walk in Central Park， listened carefully to me， and finally said， "That sounds like a really good idea， but it would be an even better idea for someone who didn't already have a good job." That logic made some sense to me， and he convinced me to think about it for 48 hours before making a final decision. Seen in that light， it really was a difficult choice， but ultimately， I decided I had to give it a shot. I didn't think I'd regret trying and failing. And I suspected I would always be haunted by a decision to not try at all. After much consideration， I took the less safe path to follow my passion， and I'm proud of that choice.