Mathematics is not a deductive science—that's a cliché. When you try to prove a theorem, you don't just list the hypotheses and then start to reason. What you do is trial and error, experimentation, guesswork.
译文:人们只看到了利益却不能看见事情带来的危害,鱼儿只看见了食物却不知道食物上有鱼钩。赏析:我们做任何事不能只看到有利的一面,还要重视不利的一面。有利就有弊,有弊就有利,这是万物的规律。人追求名利没有错,但为了名利而忽视自身的安全就得不偿失了。