多疑的人是不会因此而满足的；他们往往不是因为有了什么理由而嫉妒，只是为了嫉妒而嫉妒，那是一个凭空而来、自生自长的怪物。

数学中最重要的是理解概念，而不仅仅是记忆公式。

我不做容易的事。我让事情发生。

The best way to predict the future is to create it.

Einstein was wrong when he said, 'God does not play dice'. Consideration of black holes suggests, not only that God does play dice, but that he sometimes confuses us by throwing them where they can't be seen

To write is to leave a trace, to make a mark on the world.