Merlin’s beard, Harry, you made me jump,” said Slughorn, stopping dead in his tracks and looking wary. “How did you get out of the castle?”
“I think Filch must’ve forgotten to lock the doors,” said Harry cheerfully, and was delighted to see Slughorn scowl.

“The mind is a complex and many-layered thing, Potter... or at least, most minds…”

“When you were straight, evil thoughts and memories came pouring up out of the d…”

“Her grief was so big and wild it terrified her, like an evil beast that had eru…”

“Bangs and smoke were more often the marks of ineptitude than expertise.”