A great novel is one that changes the reader, that leaves him different after the last page.
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
数学不是关于数字、方程、计算或算法的:它是关于理解的。
历史不仅仅是关于过去;它是关于理解现在和塑造未来。
我们对明天认识的唯一限制是我们今天的怀疑。