Your ledger is dripping it's gushing red. You think saving a man no more virtuous than yourself will change anything? This is the basest sentimentality. This is a child at prayer. Pathetic! You lie and kill in the service of liars on killers. You pretend to be separate, to have your own code, something that makes up for the horrors. But they are a part of you, and they will never go away. 

~Loki, The Avengers