The only way to get to the other side is to go through the door.

做数学的艺术在于找到那个包含所有普遍性萌芽的特殊案例。

Out, out, brief candle! Life's but a walking shadow, a poor player That struts and frets his hour upon the stage And then is heard no more. It is a tale Told by an idiot, full of sound and fury, Signifying nothing, 

The people who are crazy enough to think they can change the world are the ones who do.

Be nice to your children because they are going to choose your nursing home.

The only person you should try to be better than is the person you were yesterday.

"Light is everything. It defines form, creates space, and gives life to the painting."