“No thief, however skillful, can rob one of knowledge, and that is why knowledge is the best and safest treasure to acquire.”

“...but those as knows the least have a habit of thinkin' they know all there is to know, while them as knows the most admits what a turr'ble big world this is. It's the knowing ones that realize one lifetime ain't long enough to git more'n a few dips o' the oars of knowledge.”

“A baby has brains, but it doesn't know much. Experience is the only thing that brings knowledge, and the longer you are on earth the more experience you are sure to get.”

“...it is always wise to do one's duty, however unpleasant that duty may seem to be." -Ozma”

“Can't you give me brains?" asked the Scarecrow."You don't need them. You are learning something every day. A baby has brains, but it doesn't know much. Experience is the only thing that brings knowledge, and the longer you are on earth the more experience you are sure to get.”

“I shall take the heart. [...] For brains do not make one happy, and happiness is the best thing in the world.”

“I am Oz, the Great and Terrible," spoke the Beast, in a voice that was one great roar. Who are you, and why do you seek me?”