Loris D.

“The truth." Dumbledore sighed. "It is a beautiful and terrible thing, and should therefore be treated with great caution.”
― J.K. Rowling, Harry Potter and the Sorcerer's Stone

“Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.”
― J.K. Rowling, Harry Potter and the Goblet of Fire

“Do you remember me telling you we are practicing non-verbal spells, Potter?"
"Yes," said Harry stiffly.
"Yes, sir."
"There's no need to call me "sir" Professor."
The words had escaped him before he knew what he was saying.”
― J.K. Rowling, Harry Potter and the Half-Blood Prince

“Of course it is happening inside your head, Harry, but why on earth should that mean that it is not real?”
― J.K. Rowling, Harry Potter and the Deathly Hallows