"It's not what you look at that matters, it's what you see."
Don't be embarrassed by your failures, learn from them and start again.
数学不是关于数字、方程、计算或算法的:它是关于理解的。
青春美酒并不总是随岁月流逝而日渐清彻,有时它会日渐混浊。
幸福的准则:有事做,有人爱,有所期待。