数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
The most important thing in science is not so much to obtain new facts as to discover new ways of thinking about them.
The book is a mirror: if an ape looks into it, an apostle is unlikely to look out.
作品总是在与其他作品对话。