I dont really live by it but out of all the quotes i've ever heard i remember this one:
"Fairytales don't teach children dragons exist. Children already know dragons exist, Fairytales tell children that dragons can be killed."
--G. K. Chesterton

"There is no one true way"-This comes from the Valdemar novels by Mercedes Lackey.

"The truth shall make you free" is the quote that i most admire and try to live by. It's from the bible.

When you really want something, the universe will conspire in order for you to have it. -The Alchemist