It is the unknown we fear when we look upon death and darkne... - J.K. Rowling, Harry Potter and the Half-Blood Prince

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

"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."

"It is impossible to manufacture or imitate love."

"It's going to be all right, sir,"Harry said over and over again, more worried by Dumbledore's silence than he had been by his weakened voice. "We're nearly there ... I can Apparate us both back ... don't worry ...""I am not worried, Harry,"said Dumbledore, his voice a little stronger despite the freezing water. "I am with you."

"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?"