数学不是关于数字、方程、计算或算法的：它是关于理解的。
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
A great army is a great sickness.
We thought that we had the answers, it was the questions we had wrong.
I’m a very positive thinker, and I think that is what helps me the most in difficult moments.
所以,天地不夸耀自己的明亮,大水不夸耀自己的清澈,大火不夸耀自己的炎烈,有德之君不夸耀自己德行的高远,这样才能做众人的。