衡量一个领导者的真正标准不是他们有多少追随者，而是他们培养了多少领导者。

Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.

I usually say what Ireally think. A great mistake nowadays, it makes one so liable to be misunderstood.

发现可能性的极限的唯一方法就是超越它们进入不可能。