People are a lot like books.

Each is unique. Each has it's own story. But if you didn’t open the cover of a book, you’ll never know the story of that person. You can hear the story second hand but you'd never form your own opinion. It's the same with people. You can see how they look but unless you really watch them and let them open up to you, you never know who they really are. -
http://denity.tumblr.com/post/1480350105/people-are-a-lot-like-books-each-is-unique-each-has