“Don’t judge a book by its cover”
Well, at least try not to. I know it is hard for many of us. Some would even argue that it is being clever. I agree when it helps you save some time. And when you do that, I would use the word wise in place of clever. Given a chance, I would not even be bothered to open a book if I have a strong feeling that this is what is going to be inside. I proudly credit that to my experience and my gut feeling.