By all means continue destroying my possessions. I daresay I... - J.K. Rowling, Harry Potter and the Order of the Phoenix

"His priority did not seem to be to teach them what he knew, but rather to impress upon them that nothing, not even... knowledge, was foolproof."

"Well, we were always going to fail that one,"said Ron gloomily as they ascended the marble staircase. He had just made Harry feel rather better by telling him how he told the examiner in detail about the ugly man with a wart on his nose in the crystal ball, only to look up and realize he had been describing the examiner's reflection."

"Don’t put your wand there, boy! ... Better wizards than you have lost buttocks, you know!"

"Mistletoe,"said Luna dreamily, pointing at a large clump of white berries placed almost over Harry's head. He jumped out from under it. "Good thinking,"said Luna seriously. "It's often infested with nargles."

"Wit beyond measure is a man's greatest treasure."