"[H]e told me there wasn't any passion to it. Told me that he'd been planning to kill somebody for about as long as he could remember. Said that if they turned him out he'd do it again. Said he knew he was going to hell. Be there in about fifteen minutes."'

"Some men aren't looking for anything logical, like money. They can't be bought, bullied, reasoned or negotiated with. Some men just want to watch the world burn."

"His intellect remains intact, but his heart was stripped of any morality or decency."

"I AM the Devil!"

"Look at me! I am sublime!!! I am the true face of evil!!!!!

"That right there? That's the difference between bona fide true Evil with a capital "E" and your whiny, "evil, but for a good cause" crap."

Bullshit! Don't you understand what he did? [...] He is not a psychopath! He is an iceman. He is a monster.

"I cast about for a man to aid me, and chose the Falcon, because of his utter lack of all characteristics men call good."

"He has no control over the darkness in his heart. [...] He's an abomination beyond hope of salvation."

"I met this six-year-old child, with this blank, pale, emotionless face, and the blackest eyes... the Devil's eyes. I spent eight years trying to reach him, and then another seven trying to keep him locked up because I realized what was living behind that boy's eyes was purely and simply... evil."

"I love no one in this world other than myself! I will gouge out your heart as a gift to my lord!"

"Seriously, I can't believe you just asked me that! OK, all right, fine! How about this reason? Seems as good as any. I do all the wonderful things I do because I want to see the miserable look on the faces of people like YOU when you're wallowing in despair, dismay, grief, frustration, misery... all sorts of other unpleasant nouns... I guess you could say I'm bored. At least misery is interesting."

''You can tell the Angels in Heaven You never saw Evil so singularly personified as You did in the face of the man who killed You.

You're no perfect being! You're a monster in human form! No mercy! No forgiveness!!!

He was obsessed with becoming the Devil. So much he killed his own wife; for that he butchered innocent people, too. He's the most vile kind of creature.

"This man Makarov is fighting his own war and he has no rules. No boundaries. He doesn't flinch at torture, human trafficking, or genocide. He's not loyal to a flag or a country or any set of ideals. He trades blood for money."

"It wasn't a popularity contest. He was a psychopath, a monster."

Bertrand: Cole, don't press me. If I turn into that thing again, oh, there will be blood on our hands.

Cole: Blood? You're the one trying to trick humanity into killing anybody with a power!

Dahlia Hawthorne: Do you understand why I would kill my cousin now? What my goal was?

Phoenix: Obviously... It's because you were helping your mother.

Dahlia: Helping...? Don't make me laugh. From the day I was born to the day I died, I never helped anyone!

Those eyes... as cold as ice!! The eyes of someone who could kill countless people without feeling a thing!

Kill one kid, kill two kids, it's all the same to me...

These kinds of guys don't change. Y-you think they ever suddenly wake up and realize the error of their ways and clean up their act? No! They just keep ruining everyone's lives, and the world is better off without 'em.

Tell your assassin to aim for the head — because she doesn't have a heart!

"I know nothing of philosophical philanthropy. But I know what I have seen, and what I have looked in the face in this world here, where I find myself. And I tell you this, my friend, that there are people (men and women both, unfortunately) who have no good in them — none. That there are people whom it is necessary to detest without compromise. That there are people who must be dealt with as enemies of the human race. That there are people who have no human heart, and who must be crushed like savage beasts and cleared out of the way."

"His knowledge remained woefully incomplete, Harry! That which Voldemort does not value, he takes no trouble to comprehend. Of house-elves and children's tales, of love, loyalty and innocence, Voldemort knows and understands nothing. Nothing. That they all have a power beyond his own, a power beyond the reach of any magic, is a truth that he has never grasped."

"Dragovich has no fear, no conscience, no weakness."

"One shudders to imagine what inhuman thoughts lie behind that mask. What dreams of chronic and sustained cruelty..."

"Yes. Let me ask you a question, young man. Do you believe in evil? The kind that revels in the destruction of the world and of mankind with it? The kind of evil that thrives on the pain, suffering, and sorrow of innocents?"

"You know, there's being mean in a movie, and then there's being the devil. This is being the devil's devil. The devil the devil goes to when the devil's not being devilish enough."

I'm the worst kind of person there is."

If there is such a thing as the work of the Devil, then there's no doubt it's what happened in this incident.

Data: You are capable of great sadism and cruelty. Interesting. No redeeming qualities whatsoever.
Armus: So, what do you think?
Data: I think you should be destroyed.

"All my life, you told me that the world was a dark, cruel place. But now I see that the only thing dark and cruel about it is people like you!"

"I see nothing but evil in your eyes."

"Iris, you aren't human after all."