证明的优雅与其正确性同样重要。

The most important thing is to awaken in the child his own will and ability to create.

人类是一个太阳；感官是他的行星。

The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.

The beauty of instrumental variables is that they allow us to see the world in a new light.

你不需要是天才或远见者，甚至不需要大学毕业生才能成功。你只需要一个框架和一个梦想。