A rare book dealer, while seeking out the last two copies of a demon text, gets drawn into a conspiracy with supernatural overtones.

Liana Telfer: Don't fuck with me!
Dean Corso: I thought I already did.
Boris Balkan: [reciting the secret meaning of the illustrations] To travel in silence / by a long and circuitous route, / To brave the arrows of misfortune / and fear neither noose nor fire, / To play the greatest of all games / and win, foregoing no expense / is to mock the vicissitudes of Fate / and gain at last the key / that will unlock the Ninth Gate.
Boris Balkan: There's nothing more reliable than a man whose loyalty can be bought for hard cash.
Ceniza: Even Hell has its heroes, seƱor.
Boris Balkan: You must see her again.
Dean Corso: Are you kidding? Have you seen her secretary?
Boris Balkan: Try the lunch break.
Boris Balkan: [performing the ceremony] Now you can watch! I'm entering uncharted territory. Taking the road that leads to equality, with God. You can't come with me... I must travel alone but you may look on, and marvel.
Dean Corso: That's very kind of you.
Boris Balkan: Indeed it is. There have been men who have been burned alive or disemboweled for just a glimpse of what you are about to witness.
Bernie: I already told him I had no part of this operation.
Dean Corso: Except ten percent.
Bernie: Twenty percent. The Swiss was my client.
Dean Corso: [shakes his head] No deal.
Bernie: Fifteen. For my children's sake.
Dean Corso: You don't have any children.
Bernie: I'm still young. Give me time.
Dean Corso: [expels a lungful of smoke, unmoved] Ten.
[last lines]
Boris Balkan: It's miraculous I feel nothing! Nothing at all.
Boris Balkan: Look around you, all of you, what do you see? A bunch of buffoons, in fancy dress. You think the prince of Darkness would actually deign to manifest himself before the likes of you? He never has and he never will. Never!
The Girl: What do you plan to do if you see them?
Dean Corso: I'll probably hide behind you.
Liana Telfer: You work for money I take it.
Dean Corso: What else?
Liana Telfer: I have a great deal of money.
Dean Corso: I'm very happy for you.
The Girl: He's dead, who cares?
Dean Corso: I do. I could easily wind up the same way.
The Girl: Not with me around, to look after you.
Dean Corso: Oh, I see, you're my Guardian Angel, then.
The Girl: If you say so.
Baroness Kessler: My latest work: "The Devil: History and Myth" - a kind of biography. It will be published early next year.
Dean Corso: Why the devil?
Baroness Kessler: [laughs] I saw him one day. I was fifteen years old, and I saw him as plain as I see you now. It was love at first sight.
Dean Corso: You know, 300 years ago, you'd have been burned at the stake for saying something like that.
Baroness Kessler: 300 years ago I wouldn't have said it!
Boris Balkan: Behold, I plunge my hands in fire! I feel no heat!
Dean Corso: That's just great! Give us another.
Boris Balkan: [Crashing the black mass] Mumbo Jumbo! Mumbo Jumbo!
[shouts]
Boris Balkan: MUMBO JUMBO! Mumbo Jumbo!
Dean Corso: [pulls Liana's gun on him] Stand aside.
Boris Balkan: I credited you with more finesse.
Dean Corso: You heard me. Stand back!
Boris Balkan: Put that away. It's not your style.
[upon overpowering him and shoving him into a hole in the floor]
Boris Balkan: It seems you found your proper niche at last... I like that.
Dean Corso: [indicating to the engravings] You killed for those! They're worth more than money.
Boris Balkan: Infinitely more. But they happen to be mine... not yours.
[has found Balkan in a castle with the readings and now confronts him]
Boris Balkan: [nervous] Corso.
Dean Corso: What were you expecting? An apparition?
Boris Balkan: You're not wanted here, Mr Corso. Leave!
Dean Corso: I'm the only apparition you'll see tonight.
Boris Balkan: [calmly trying to get rid of Dean so he can have this moment all to himself] You'll find a check at my New York office. Payment in full.
Baroness Kessler: They think they owe their wealth and success to membership in the Order.
Dean Corso: Where's the last engraving? I want it!
The Girl: You're running low on gas.
Boris Balkan: You don't like me, do you?
Dean Corso: I don't have to like you, you're a client and you pay well.
Boris Balkan: Our relations have always been strictly commercial, and that's the way I like it. The professional and the personal should be mutually exclusive.
Dean Corso: Listen, I came here to do some business, not shoot the breeze. If you want to expound your personal philosophies, write another book.
Dean Corso: I'll be damned!
Boris Balkan: [speaking of the engravings in 'The Nine Gates of the Kingdom of Shadows'] They form a kind of satanic riddle. Correctly interpreted with the aid of the original text and sufficient inside information, they are reputed to conjure up the Prince of Darkness in person.
[first lines]
Dean Corso: It's an impressive collection. You have some very rare editions here. Are you sure you want to sell them all?
Old Man's Son: They're of no use to father. Not anymore. Not since he's been this way. His library was his whole world. Now it's just a painful memory.