Every tree planted today is a legacy for generations we will never meet.
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。
做一件事如果琢磨太久，就永远做不成。
Every life is in many days, day after day. We walk through ourselves, meeting robbers, ghosts, giants, old men, young men, wives, widows, brothers-in-love, but always meeting ourselves.
灵魂被其思想的颜色所染色。