'There's a lot of ugly things in this world, son. I wish I could keep 'em all away from you. That's never possible.'-Atticus

'Why reasonable people go stark raving mad when anything involving a Negro comes up, is something I don't pretend to understand.' ~ Chapter 9, spoken by the character Atticus
'They're certainly entitled to think that, and they're entitled to full respect for their opinions... but before I can live with other folks I've got to live with myself.' ~Chapter 11, spoken by the character Atticus
Harper Lee's To Kill a Mockingbird was banned from a Secondary School in Canada following a lone complaint from a parent about the use of a racial slur. Ironically, the book talks about racial injustace.
http://classiclit.about.com/b/2008/09/28/save-a-banned-book-today.htm