In the midst of winter, I found there was, within me, an invincible summer.
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
數(shù)學不是關于數(shù)字、方程、計算或算法的：它是關于理解的。
Life is not about what you can’t do, it’s about what you can do.
The best fertilizer is the farmer's shadow.