真实世界是最抽象的东西。
The real world is the most abstract thing of all.
The most beautiful music comes from the heart.
"The pursuit of knowledge is the most noble of endeavors."
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.
对做好自己的事感到满足，不必理会别人如何议论你。
如果人们不相信你在乎他们，你就无法领导他们。