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：它是关于理解的。
Always strive for excellence, not perfection.
A lady's imagination is very rapid; it jumps from admiration to love, from love to matrimony in a moment.
素描不仅是测量并且记录，而且还是接纳。