We must be free not because we claim freedom, but because we practice it.

The best technology is the one that solves real problems.

Art should comfort the disturbed and disturb the comfortable.

可信因果推断的关键不仅是方法，还有方法与当前问题的契合度。

"The act of reading is as creative as the act of writing."

人心难测，表面友善的人，内心未必真诚。  

"Randomized experiments are the gold standard for causal inference, but they are not always feasible."

我们不能忽视煤炭的经济作用，但也不能忽视其环境影响。