Explain the significance of miss Maudie statement about things behind closed doors

Miss. Maudie's statement is significant because so much of To Kill a Mockingbird has to do with people making assumptions and passing judgment. This not only relates to Boo, but to Dill's life at home, and Mayella's actions and subsequent accusations against Tom. We none of us know what goes on when the doors close in our neighbors' homes..... but closed doors, unfortunately, don't keep people from talking.