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。
The essence of causal inference is to go beyond the data and ask what would happen if we intervene.
金融模型的真正考验不在于它有多复杂，而在于它是否能很好地捕捉经济问题的本质特征。
No one is an artist unless he carries his picture in his head before painting it.
Have an aim in life，or your energies will all be wasted.
The meaning of life is to find your gift. The purpose of life is to give it away.
团结是正义的另一面，它植根于生活世界的交往结构中。