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.

在生命中寻找意义的努力是人类的主要动力。

There is no such thing as society: there are individual men and women, and there are families.

谎言已走了半个世界，真话才在动身。