There are only two tragedies in life: one is not getting what one wants, and the other is getting it.
生活中只有两种悲剧：一个是没有得到我们想要的，另外一个是得到我们想要的。
A mathematician's work is mostly a solitary pursuit, but it builds on the work of many others.
We have a responsibility to future generations to leave the planet in better shape than we found it.
我们有责任为子孙后代留下一个比我们发现时更好的地球。
Without rules, there can be no true art.