我已经履行了我的职责。我证明了庞加莱猜想，我在数学上没有什么可做的了。

We cannot be sure of having something to live for unless we are willing to die for it.

释义：开始时做得好的人确实很多，但能够坚持到底的人却很少。这句话揭示了人们在做事过程中往往容易虎头蛇尾，难以善始善终。 

做出伟大工作的唯一方法就是热爱你所做的事。

For as long as I can remember, Mom has been a middle-aged woman, but no one told me she used to be a young girl.

Marine protected areas are like savings accounts for fish populations.