In a rapidly changing market, only continuous learning and adaptation can maintain competitiveness.

"The most important thing in empirical work is to be clear about the question you are trying to answer."

To write is to fight against oblivion.

不去尝试办不到的事情, 不去追求得不到的东西, 不居于不能持久的地位, 不推行不可重复的政策。