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

常反省自身，少议论他人，是最高级的修养。  

朗兰兹纲领是探索数学最深奥谜团的框架。

"The most thought-provoking thing in our thought-provoking time is that we are still not thinking."

As to the gods, I have no means of knowing either that they exist or that they do not exist. For many are the obstacles that impede knowledge, both the obscurity of the question and the shortness of human life.

Everything flows, everything changes, nothing remains.