The best way to cheer yourself up is to try to cheer somebody else up.

"We do not write to be understood; we write in order to understand."

The improvement of understanding is for two ends: first, our own increase of knowledge; secondly, to enable us to deliver that knowledge to others.

我们对宇宙了解得越多，就越意识到我们还有多少尚未发现的东西。