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。
美的事物是永恒的喜悦:它的可爱与日俱增;它永远不会化为乌有。
The greatest investment risk is not the volatility of prices, but whether you will suffer a permanent loss of capital.