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

"When you have seen as much of life as I have, you will not underestimate the power of obsessive love."

"Sometimes you remind me a lot of James. He called it my 'furry little problem' in company. Many people were under the impression that I owned a badly behaved rabbit."

"It was, he thought, the difference between being dragged into the arena to face a battle to the death and walking into the arena with your head held high. Some people, perhaps, would say that there was little to choose between the two ways, but Dumbledore knew - and so do I, thought Harry, with a rush of fierce pride, and so did my parents - that there was all the difference in the world."

"It is impossible to manufacture or imitate love."

"The thing about growing up with Fred and George,"said Ginny thoughtfully, "is that you sort of start thinking anything's possible if you've got enough nerve."

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

"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?"

"Am I about to discover where you, Ron, and Hermione disappeared to while you were supposed to be in the back room of Fred and George's shop?''How did you...?''Harry, please. You're talking to the man who raised Fred and George."

"It is the unknown we fear when we look upon death and darkness, nothing more."

"Why are you worrying about YOU-KNOW-WHO, when you should be worrying about YOU-NO-POO? The constipation sensation that's gripping the nation!"

"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."

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

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

"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?"

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

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

"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."

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

"What do I care how 'e looks? I am good-looking enough for both of us, I theenk! All these scars show is zat my husband is brave!"

"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."