“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.”

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

“If you went to a home, kicked down the front door, chased the people who lived there out into the street and said, "Go! You are free! Free as a bird! Go! Go!" -- do you think they would shout and dance for joy? They wouldn't. Birds are not free. The people you've just evicted would sputter, "With what right do you throw us out? This is our home. We own it. We have lived here for years. We're calling the police, you scoundrel.”

“Have you had a chance to talk with your colleagues?Talk? We don't talk. They dictate. I tell them to fuck off.”

“From a House of vampires to a house of politicians,” he muttered as we walked to the front door.“Said the most political of vampires,” I reminded him, and got a growl in response.”

“Common courtesy dictates that we never drain the lifeblood of anyone to whom we've been formally introduced.”