“Courtesy dictates that we offer fellow wizards the opportunity of denying us entry.”

“Professor, why couldn't we just Apparate directly into your old colleague's house?''Because it would be quite as rude as kicking down the front door,' said Dumbledore. 'Courtesy dictates that we offer fellow wizards the opportunity of denying us entry.”

“Why, dear boy, we don't send wizards to Azkaban just for blowing up their aunts.”

“Harry -- yer a wizard.”

“Wands are only as powerful as the wizards who use them. Some wizards just like to boast that theirs are bigger and better than other people's.”

“Apparently wizards poke their noses in everywhere!”

“I am a wizard, not a baboon brandishing a stick.”