Every challenge is an opportunity to grow stronger and wiser.

Among thousands of people, you meet those you've met. Through thousands of years, across the boundless wilderness of time, you happen to meet them, neither earlier nor a bit too late. There is nothing to be said except to ask lightly, "Oh, you're here too?"

一本伟大的书是那种让你改变的书，它给你带来对生活的新视角和对人类状况的更深理解。

Freedom is never voluntarily given by the oppressor； it must be demanded by the oppressed.

"In observational studies, we often have to rely on assumptions that are not directly testable."