成功不是幸福的关键。幸福才是成功的关键。

If somebody offers you an amazing opportunity but you are not sure you can do it, say yes – then learn how to do it later!

And when they leave,they take your life of details with them. You are expected to move on again, but you don't remember what it was that moved you, because no one's asked you in so long. Not even yourself.

The only way to learn mathematics is to do mathematics.