The only way to find the limits of the possible is by going beyond them into the impossible.
The real voyage of discovery consists not in seeking new landscapes, but in having new eyes.
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
数学不是关于数字、方程、计算或算法的:它是关于理解的。
It is not shame for a man to learn that which he knows not,whatever his age.