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。
Stupid is as stupid does.
Most men lead lives of quiet desperation.
To imagine is everything, to know is nothing at all.
Well may the boldest fear and the wisest tremble when they contemplate the situation of our country.
Design is not just what it looks like and feels like.Design is how it works.