I've learned that you can't control what other people think of you, but you can control what you think of yourself.

保存就是转变。

The best way to learn econometrics is by doing—working with real data and real problems.

我们必须记住，(地球)这是一颗非常小的恒星，可能还有一些更大、更重要的恒星，可能是非常虚拟和快乐的（更适合人类居住？）。