That man, I think, has had a liberal education who has been so trained in youth that his body is the ready servant of his will.  

"Don't confuse motion with progress."

革命道德不是从天上掉下来的。它是在日常斗争中培养，在革命活动中锤炼的。

In mathematics, the journey of discovery is often more rewarding than the destination itself.

膨胀的概念是宇宙在其最早的时刻经历了一段极其迅速的扩张期。

I love to think of nature as an unlimited broadcasting station, through which God speaks to us every hour, if we will only tune in.

"I wish I could freeze this moment, right here, right now, and live in it forever."

The only defense against the world is a thorough knowledge of it.