We always say that you can't judge a book by its cover. Don't judge people by what's on the outside -- get to know them and judge them by what's on the inside. Sayings like these always seem braided up in political correctness. However, we know it's difficult if impossible not to judge a book by its cover. To live in the social world means that we are constantly reading messages given off by other people, judging (or maybe "reading") them even when we're not being judgmental.