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

进步的概念必须建立在灾难的观念之上。

The good man is the man who, no matter how morally unworthy he has been, is moving to become better.

"Children are the best critics because they are honest and direct."

世界是一台机器，而我们是它的故障零件。