Happiness is not something ready made. It comes from your own actions.

I was born with an enormous need for affection, and a terrible need to give it.

The American farmer is the only man in our economy who has to buy everything he buys at retail, sell everything he sells at wholesale, and pay the freight both ways.

对黑洞的研究将我们带到了理解的边缘，在那里已知的物理定律失效，新的理论必须出现。

生活是我们创造的。旅行者是旅行本身。我们看到的不是我们看到的东西，而是我们自己。