I figured you wouldn't get many as some are kinda obscure. They are from:
The Homeward Bounders by Diana Wynne Jones, who you should try it you haven't already.
Incarceron by Catherine Fisher, which I don't care for apart from that one line.
The next two are from The Death-Defying Pepper Roux by Geraldine McCaughrean.
And, obviously, the hitchhiker' s guide to the galaxy.
Have you read any of Tamora Pierce' s books? I can't think of a good quote, but I love all of her books.