“The demons are always around and he knows it.”

“Demon pox. There's always demon pox.”

“Such a perilous concentration of demons would create chaos all around it.”

“An artist is a creature driven by demons. He doesn't know why they choose him and he's usually too busy to wonder why.”

“Nobody knows if Zidane is an angel or demon. He smiles like Saint Teresa and grimaces like a serial killer.”

“God knows the past, the present and the future. Therefore, He created angels, demons, and men mixed together for a specific purpose.”

“"Why are you filming this?"
"When the cat is away, the mice will play… Always good to remind the mice that in this case, when the cat is away, the mice will all be eaten by demons. I'm going to send this video file to everyone one of our Downworlder contacts around the world. Just a reminder that there are demons we need Shadowhunters to destroy. That's why they exist."”

“But if you can confront your inner demons—"

"I did confront my inner demon. I punched him in the face and he exploded."

Valkyrie had to laugh. "But now he's back."

"Of course he's back. He's resourceful. He isinner demon, after all.”

“I know there’s evil in the world, and there always has been. But you don’t need to believe in Satan or demons to explain it. Human beings are perfectly capable of evil all by themselves.”

“Demons are wary of talking and must be forced to speak. When demons are voluntarily chatty it's a trick to distract the exorcist. We must never ask useless questions out of curiosity. We but must interrogate with care. We always begin by asking for the demon's name.”