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.

I've been through a lot in my life, and I'm still here.

I'm not bossy. I'm the boss.

在上位的有什么爱好，在下面的人一定爱好得更加利害。