Happiness is not the absence of problems, but the ability to deal with them.

生活中最大的荣耀不在于从不跌倒，而在于每次跌倒后都能站起来。

The secret of joy in work is contained in one word – excellence. To know how to do something well is to enjoy it.

数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。