如果你早上起床，认为未来会更好，那就是美好的一天。否则，就不是。

Science is about understanding the world, and engineering is about changing it.

That's exhilarating if you're doing well, and very crushing if you're not. It leads, in the worst cases -- in the analysis of a sociologist like Emil Durkheim -- it leads to increased rates of suicide. There are more suicides in developed, individualistic countries than in any other part of the world. And some of the reason for that is that people take what happens to them extremely personally -- they own their success, but they also own their failure.

The pursuit of mathematical knowledge is a journey that never ends; there is always more to discover and understand.

写作是一种勇气，因为它要求我们面对自己内心最深处的恐惧和欲望。