"There's stories and then there's stories. The ones with any worth change your life forever, perhaps only in a small way, but once you've heard them,they are forever a part of you. You nurture them and pass them on, and the giving only makes you feel better.The others are just words on a page."
- Charles de Lint

"Why do you think people believe in God? It's because they want to. It's not easy living in this rotten world. There is nothing certain while living on in this world. Do you get it? God didn't create humans. Humans created God."
--Cowboy Bebop

Also, some old Bogart movies, such as The Big Sleep and Casablanca, have really superb dialogue filled with memorable quotes.