I have a quote in my classroom similar to this. "You know you've read a good book when you finish it and it feels as if you've lost a friend." Each time I read Twilight and the Harry Potter series I feel this way.
There will always be a conflict in your classroom about how something is not fair and this poster would be great to have up in the classroom. When students start a confrotnation on conflict point at the poster and have each student read it aloud.