My Head of House said I lacked certain necessary qualities..... - J.K. Rowling, Harry Potter and the Order of the Phoenix

"Yeah, Quirrell was a great teacher. There was just that minor drawback of him having Lord Voldemort sticking out of the back of his head!"

"But Dumbledore says he doesn't care what they do as long as they don't take him off the Chocolate Frog cards."

"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."

"I’ll make Goyle do lines, it’ll kill him, he hates writing,” said Ron happily. He lowered his voice to Goyle’s low grunt and, screwing up his face in a look of pained concentration, mimed writing in midair. “I... must... not... look... like... a... baboon’s... backside."

"The mind is a complex and many-layered thing, Potter... or at least, most minds are..."