工具变量的美妙之处在于它们让我们以新的视角看世界。

故事的真正力量不在于它的情节，而在于它唤起的情感和引发的思考。

The best revenge is massive success.

I don’t think that when people grow up, they will become more broad-minded and can accept everything. Conversely, I think it’s a selecting process, knowing what’s the most important and what’s the lest. And then be a simple man.

可持续性不是成本——而是对韧性和长期增长的投资。

The universe we observe has precisely the properties we should expect if there is, at bottom, no design, no purpose, no evil and no good, nothing but blind, pitiless indifference.

The beauty of mathematics is that it is universal.