我专注于我需要做的事来变得更好。
In science, we must be interested in things, not in persons.
一个个都说∶我是向上效法了尧、舜、夏禹、商汤、周文王、周武王的大道。”但所说的话却是互相攻击的,所行的事是截然相反的。 
一个设计良好的系统是能够随着时间的推移而发展,而不需要大量的返工。
A journey is a person in itself; no two are alike. And all plans, safeguards, policing, and coercion are fruitless. We find after years of struggle that we do not take a trip; a trip takes us.
学习计量经济学的最佳方法是通过实践——处理真实的数据和真实的问题。