"Causal inference requires careful thought about the assumptions underlying your analysis."

"We do not write because we want to; we write because we have to."

自我不是现成的东西，而是通过行动选择不断形成的东西。

"Every character is a world, and every world is a question."

解释：君子不因为天色昏暗而毁弃自己的行为举止。