"You've done beautifully. Now let me take it from here."

"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." 

[Sirius Black]

The Death Of Sirius - Nicholas Hooper - Harry Potter And The Order Of The Phoenix (2007)