世界不是游乐场，而是思想和利益的战场。

The end of law is not to abolish or restrain, but to preserve and enlarge freedom.

我不会假装在冠状病毒到来之前一切都很完美。

决策的质量不是由其结果来衡量，而是由做出决策的过程来衡量。

所有的真理一旦被发现，都很容易理解；关键在于发现它们。

 Happiness is at your feet, if only you are willing to lower your head and look for it.

The mathematician's best work is art, a high perfect art, as daring as the most secret dreams of imagination, clear and limpid.

There's nothing more American than a coal miner.