A belief is like a guillotine, just as heavy, just as light.

 释义：身体没有受到饥饿和寒冷的痛苦，这是上天不曾亏待我；若是我的学问无所进步，我有何颜面去面对上天呢?

最重要的事莫过于享受你的人生，活得开心，这是最重要的。

The essence of causal inference is to go beyond the data and ask what would happen if we intervene.