每本书都是一次旅程，每次旅程都是一本书。
The only way to achieve greatness is to love what you do.
如果一个社会中的大部分成员贫穷而悲惨，那么这个社会就谈不上繁荣幸福。
In the quest for understanding the cosmos, we must embrace the unknown and the unknowable.
If you're not stubborn, you'll give up on experiments too soon. And if you're not flexible, you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve.