You can't go home again.

There is no easy walk to freedom anywhere, and many of us will have to pass through the valley of the shadow of death again and again before we reach the mountaintop of our desires.

如果你要创新，就必须愿意被误解。

历史学家是反向的先知。

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。

释义：内心纷杂不净，难以领悟真理；意志不坚定，难以成就功业。

唯一的好是知识，唯一的恶是无知。