"Paranoid? Probably. But just because you're paranoid doesn't mean there isn't an invisible demon about to eat your face."
— Jim Butcher (Storm Front)

""You know what I am." The words breathed out in an auguished whisper. "I'm part demon, Clary. Part demon. You understood that much, didn't you?" His eyes bored into her like drills. "You saw what Valentine was trying to do. He used demon blood-used it on me before I was even born. I'm part monster. Part everthing I've tried so hard to burn out, to destroy.""
— Cassandra Clare (City of Glass)

"...And, all at once, the moon arouse through the thin ghastly mist, And was crimson in color... And they lynx which dwelleth forever in the tomb, came out therefrom. And lay down at the feet of the demon. And looked at him steadily in the face."
— Edgar Allan Poe

"There's a hole in the world like a great black pit
and the vermin of the world inhabit it
and its morals aren't worth what a pig could spit
and it goes by the name of London.
At the top of the hole sit the privileged few
Making mock of the vermin in the lonely zoo
turning beauty to filth and greed...
I too have sailed the world and seen its wonders,
for the cruelty of men is as wonderous as Peru
but there's no place like London!"
— Stephen Sondheim (Sweeney Todd: The Demon Barber of Fleet Street)

"There are very few things that live in both this world and the world of dreams. Most are gods, angels and demons. The Stone you hold was made by Vlad Valkire the son of an angel and a demon. By the divine blood that ran in his veins, Valkire could see the light and hear the song of creation -- if only as glimmerings and whispers.
"Over time, he became aware of the light and the music and as he grew so did his understanding of it. At the age of twenty two, he began his greatest labor -- the making of the Wyrd Stones. In them he captured the light and song of creation and by them some of the powers of gods, angels and demons fell into the hands of elves and men. A sorcerer who knows its secret may -- like a god, angel, or demon -- stand with one foot in this world and another within the world of dreams.
"Your Stone is a gateway into the world of dreams, Luthiel. When you sing, it opens and you are, in part, taken there. Others who hold a Wyrd Stone like yours may know when someone crosses into dream. When you sang, I could hear you quite clearly."
— Robert Fanney

""Rachel candy.""
— Kim Harrison

"no demon can posses you if you maintain the ability to turn and laugh at it"
— Rachel Roberts (Trial By Fire)

"Ha! Relationship. Is that what you're calling it now? You two get together; you break it off. You get together again...you get pissy; you leave him. Doesn't sound like much relationship is going on there...

Demon I command thee to zip thy lips until you get over your case of the grumps"
— Katie McAlister

"Nothing is very strong: strong enough to steal away a man's best years not in sweet sins but in a dreary flickering of the mind over it knows not what and knows not why, in the gratification of curiosities so feeble that the man is only half aware of them, in drumming of fingers and kicking of heels, in whistling tunes that he does not like, or in the long, dim labyrinth of reveries that have not even lust or ambition to give them a relish, but which, once chance association has started them, the creature is took weak and fuddled to shake off."
— C.S. Lewis (The Screwtape Letters)

"TODD:
The history of the world, my love --
LOVETT:
Save a lot of graves,
Do a lot of relatives favors!
TODD:
Is those below serving those up above!
LOVETT:
Ev'rybody shaves,
So there should be plenty of flavors!
TODD:
How gratifying for once to know
BOTH:
That those above will serve those down below!"
— Stephen Sondheim (Sweeney Todd: The Demon Barber of Fleet Street)

"From "Demon," when Clay meets the demon Lucian in a church....

"The crosses don't bother you?"
"They should bother you a great deal more. They were used to kill humans."
I had not thought of that.
"
— Tosca L