决定不做什么和决定做什么同样重要。

译文：贫困时的朋友不能遗忘，共患难的妻子不能抛弃。体现对情义与责任的坚守。

The past is always tense, the future perfect.

The joy of discovery is what drives mathematicians forward.

We are all in the gutter, but some of us are looking at the stars.

解释：局势安定的国家，常常是富足的；局势 动乱的国家，常常是贫穷的。

唯一能让你快乐的是你自己的微笑。

"I guess that’s just part of loving people: You have to give things up. Sometimes you even have to give them up."