“If you cannot judge a book by its cover, surely we should not judge an author by one book alone?”
“You can't judge a book by it's cover but you can sure sell a bunch of books if you have a good one.”
“You CAN judge a book by it's cover!”
“Of course you can judge a book by its cover; moreover, we are obliged to.”
“Don't judge a book by its cover”
“Never judge a book by its cover, its contents may have the inspiration one needed for progression”