Change is hard, but it is necessary for progress.

No man really knows about other human beings. The best he can do is to suppose that they are like himself.

如果你能看透每一个人的心，就会知道，没有人是普通的。每个人都值得大家站起来为他鼓掌一次。

The key to credible causal inference is not just the method, but how well the method fits the question at hand.