Well, yes, when you write something from a book it is already "something". My point is not to confront or to argue. I just want to say that we all like to make profound statements. In politics, philisophy, arts, etc it is completely fine to say: "Mao is wrong!".

But in science if you stand up and say: "Hey, you around, listen - Newton is wrong!", then you'd better have something from that Newton in your notebook (and better to have it before you stand up). Just in case if somebody says "Really?".