如果你没有偶尔失败，说明你不够努力。

The tragedy of great power politics is that even well-intentioned states are forced to act in ways that can lead to conflict and war.

"It is a capital mistake to theorize before one has data."

The best way to learn mathematics is to do mathematics.

地图不是领土。

有些事情发生了却没有留下可察觉的痕迹，没有被谈论或记录下来，尽管如果说后续事件漠不关心地继续下去，就好像这些事情从未发生过一样，那是非常错误的。