Harry Potter: This connection between me and Voldemort... what if the reason for it is that I am becoming more like him? I just feel so angry, all the time. What if after everything that I've been through, something's gone wrong inside me? What if I'm becoming bad?

Sirius Black: I want you to listen to me very carefully, Harry. You're not a bad person. You're a very good person, who bad things have happened to. Besides, the world isn't split into good people and Death Eaters. We've all got both light and dark inside us. What matters is the part we choose to act on. That's who we really are.