Though the water running in the fountain be every one's, yet who can doubt, but that in the pitcher is his only who drew it out?
我们对月球表面的了解比对海底的了解还要多。
数学的目标不是解决问题，而是理解问题。
Lock up your libraries if you like; but there is no gate, no lock, no bolt that you can set upon the freedom of my mind.
Rudeness is the weak man's imitation of strength.