因果推断的本质是超越数据，询问如果我们干预会发生什么。

你永远无法真正理解一个人，除非你从他的角度考虑问题。

The most important single central fact about a free market is that no exchange takes place unless both parties benefit.

Successful people maintain a positive focus in life no matter what is going on around them. They stay focused on their past successes rather than their past failures, and on the next action steps they need to take to get them closer to the fulfillment of their goals rather than all the other distractions that life presents to them.