J.K. Rowling, Harry Potter and the Half-Blood Prince

"Killing is not so easy as the innocent believe."

"Don't count your owls before they are delivered."

"It is impossible to manufacture or imitate love."

"Snape raised his wand and pointed it directly at Dumbledore."Avada Kedavra!"

"You are protected, in short, by your ability to love!"

"Have to? Of course you have to! But only because of you, Harry, won't rest until Voldemort is finished! Think now, for once, if you have never heard of the prophecy! What would you do?"

"I am not worried, Harry,"said Dumbledore, his voice a little stronger despite the freezing water. "I am with you."

"Oh, there you are, Albus,' he said. 'You've been a very long time. Upset stomach?''No, I was merely reading the Muggle magazines,' said Dumbledore. 'I do love knitting patterns."

"Yes, alive,” said Fudge. “That is — I don’t know — is a man alive if he can’t be killed? I don’t really understand it, and Dumbledore won’t explain properly — but anyway, he’s certainly got a body and is walking and talking and killing, so I suppose, for the purposes of our discussion, yes, he’s alive."

"Dumbledore will only leave from Hogwarts when there are none loyal to him!"

"Nobody's ever asked me to a party before, as a friend. Is that why you dyed your eyebrow, for the party? Should I do mine too?"

"And he knew that at that moment, they understood each other perfectly, and when he told her what he was going to do now, she would not say ‘be careful’ or ‘don’t do it’, but she would accept his decision because she would not have expected anything less of him."

"I am a wizard, not a baboon brandishing a stick."

"It is impossible to manufacture or imitate love."

"When we come face-to-face with one down a dark alley, we're going to be having a shufti to see if it's solid, aren't we, we're not going to be asking, 'Excuse me, are you the imprint of a departed soul?"

"Let us step into the night and pursue that flighty temptress, adventure."

"You could say sorry,"suggested Harry bluntly. "What, and get attacked by another flock of canaries?"muttered Ron."What did you have to imitate her for?""She laughed at my mustache!""So did I, it was the stupidest thing I've ever seen."

"Well you seemed too busy to call him a prat and I thought someone should."

"Dumbledore says people find it far easier to forgive others for being wrong than being right."

"An Unbreakable Vow?"said Ron, looking stunned. "Nah, he can’t have.... Are you sure?""Yes I’m sure,"said Harry. "Why, what does it mean?""Well, you can’t break an Unbreakable Vow...""I’d worked that much out for myself, funnily enough."