Theorems are the permanent literature of mathematics.
The key to credible causal inference is not just the method, but how well the method fits the question at hand.
"Reading is a form of prayer, a guided meditation that briefly makes us believe we're someone else."
阅读是一种祈祷形式，一种引导冥想，让我们短暂地相信自己变成了另一个人。