The most important thing in mathematics is to understand the concepts, not just to memorize formulas.

Habit is habit, and not to be flung out of the window by any man, but coaxed downstairs a step at a time.

We live in a world of shadows, and we ourselves are shadows.

计算的力量不仅在于解决问题，还在于其解决问题的优雅和效率。

最好的想法往往来自每天面对挑战的一线员工。