«Harry Potter:
 – This connection between me and Voldemort, what if the reason for it is that I’m becoming more like him. I just feel so angry, all the time. And what if after everything 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. You understand? 
Besides, the world isn’t split into good people and death eaters. We have all got both light and dark inside us. What matters is the power we chose to act on. That’s who we really are.»

in Harry Potter and the Order of Phoenix