I love good quotes. Some of my favorite quotes are from science fiction or fantasy books, movies, and TV shows. Here is a famous quote from The Lord of the Rings and two newer versions of it.
Do not meddle in the affairs of wizards, for they are subtle and quick to anger.
"The Fellowship of the Ring", J.R.R. Tolkien
"There's an old saying: 'Do not try the patience of wizards for they are subtle and quick to anger.'"
-- Elric to Vir in Babylon 5:"The Geometry of Shadows"
Do not meddle in the affairs of dragons, for you are crunchy and taste good with ketchup.