Dearer than eye-sight, space, and liberty; Beyond what can be valued, rich or rare;
我爱你胜过自己的眼睛 整个的空间和广大的自由。
The most powerful art often comes from the margins.
"Books can be mirrors, windows, and sliding glass doors."
Rigor in proof is what separates mathematics from all other sciences.
我们学得越多,就越意识到我们不知道的还有很多。