一流智力的检验标准是同时持有两种相反的观点，并且仍然能够正常运作。
The test of a first-rate intelligence is the ability to hold two opposed ideas in mind at the same time and still retain the ability to function.
幸福不是偶然发生的事情。它不是好运或随机机会的结果。它不是金钱可以买到或权力可以命令的东西。它不取决于你外部发生的事情，而取决于你内部发生的事情。
A mathematician is a device for turning coffee into theorems.