Everyone is in favor of free speech. Hardly a day passes without its being extolled， but some people's idea of it is that they are free to say what they like， but if anyone else says anything back， that is an outrage.

Do not put forward anything that you cannot prove by experimentation.

I don't want to be as good as I was, I want to be better than I was.

读书的时候不要只想作者怎么看，想想你自己怎么看。