The tears of the world are a constant quantity. For each one who begins to weep, somewhere else another stops. The same is true of the laugh.
The only way to get rid of a temptation is to yield to it.
眼睛看百步以內(nèi)的東西，尚且沒法看得一清二楚，而要把自己看見的就認為是實際有的，沒有看見的就認為是沒有的，這樣的話天下所沒有的東西，可就多了。
A mathematician's intuition is as important as rigorous proof.