Youth can not know how age thinks and feels. But old men are... - J.K. Rowling, Harry Potter and the Order of the Phoenix

"My Head of House said I lacked certain necessary qualities...like the ability to behave myself."

"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."

"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."

"Indifference and neglect often do much more damage than outright dislike."