数学不是关于数字、方程、计算或算法的：它是关于理解的。

上帝要谁灭亡，必先让他疯狂。

Respect your efforts, respect yourself. Self-respect leads to self-discipline. When you have both firmly under your belt, that's real power.

The function of entrepreneurs is to reform or revolutionize the pattern of production by exploiting an invention or, more generally, an untried technological possibility for producing a new commodity or producing an old one in a new way.