数学不是关于数字、方程、计算或算法:它是关于理解的。
"Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding."
美德是通过努力获得的,这完全取决于你自己。
If you don't make mistakes, you're not trying hard enough.
True sustainability means leaving the land better than we found it for future generations.