Polya’s rules

I am reading Polya’s Hot to Solve it. It’s an amazing book (one of the few math books that sold more than one million copies). Here are some of Polyia’s rules:

• Rules of discovery. The first rule of discovery is to have brains and good luck. The second rule of discovery is to sit tight and wait until you get a bright idea.
  
• Rules of style. The first rule of style is to have something to say. The second rule of style is to control yourself when, by chance, you have two things to say; say first one, then the other, not both at the same time. 
  
• Rules of teaching. The first rule of teaching is to know what you are supposed to teach. The second rule of teaching is to know a little more than what you are supposed to teach. 
  

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