What is your favorite Gandalf quote?

"A wizard is never late! He arrives precisely when he mean to!"

you shall not pass

Bilbo: "Good Morning." Gandalf: "What do you mean?" "Do you wish me a good morning, or mean that it is a good morning whether I want it or not; or that you feel good this morning; or that it is a morning to be good on?" Bilbo: All of them at once."