在探索宇宙的过程中，每一个被解答的问题都会引出更多的问题。

War is an ugly thing， but not the ugliest of things: the decayed and degraded state of moral and patriotic feeling which thinks that nothing is worth a war， is much worse.

What we have to remember is that we can still do anything. We can change our minds. We can start over.

夏天集

You have to keep thinking about what you can do to make the world a better place.

过去是一个不会停止纠缠你的幽灵。