古代善于写诗的人，并不自认为是诗人。他们胸中所积累的，高深、广阔、悠远；而偶然通过诗歌表达出来，那么诗歌也因此变得高深、广阔且悠远。

If you want to grow, you must be willing to adapt and learn from every challenge.

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