It may sound a bit smartass(to say it mightly) but I myself have to believe it.
I have to add, that the greatest knowledge came for me from people that never
read. But as I new found writer myself, I have to believe that reading for me, that is, it is not for everyone, for me it is crucial to read others.
Jane Austen (2005). “Jane Austen: 8 Books in 1”, p.460, Shoes & Ships & Sealing Wax
CRAZY LIFE 
It is what passed, in Jane’s time, for a sales pitch.
And you really think that phrase would sell to a broad audience? She´s calling most of the population stupid, whatever time period she is in. I actually found it quite amazing that a person would say that outloud yet again as I said, if I want to write I have to believe it.