定理是永恒的；它们的证明是短暂的。

The world is a very complicated place, and it's not always easy to understand what's happening around us.

"The past is never dead. It's not even past."

I hope that in this year to come, you make mistakes. Because if you are making mistakes, then you are making new things, trying new things, learning, living, pushing yourself, changing yourself, changing your world. You're doing things you've never done before, and more importantly, you're doing something.

The more the division of labor and the application of machinery extend, the more does competition extend among the workers, the more do their wages shrink together.