Courtesy of imbd.com.
I begin with my favorite: "In Sicily, women are more dangerous than shotguns."
Shall we review some more? Let's do!!
Jack Woltz: ...She was the greatest piece of ass I've ever had, and I've had 'em all over the world. And then Johnny Fontane comes along with his olive oil voice and guinea charm, and she runs off. She threw it all away just to make me look ridiculous! And a man in my position can't afford to be made to look ridiculous!
Tom Hagen: Now we have the unions, we have the gambling; and they're the best things to have. But narcotics is a thing of the future. And if we don't get a piece of that action, we risk everything we have. I mean not now, but, ah, ten years from now.
Michael: [while eating diner with Sollozzo and McCluskey] What I want - what's most important to me - is that I have a guarantee: No more attempts on my father's life.
Sollozzo: What guarantees could I give you, Mike? I am the hunted one! I missed my chance. You think too much of me, kid - I'm not that clever. All I want, is a truce.
Michael: Fredo - you're my older brother, and I love you. But don't ever take sides with anyone against the Family again. Ever.
Emilio Barzini: [during a meeting with the Five Families] Times have changed. It's not like the Old Days, when we can do anything we want. A refusal is not the act of a friend. If Don Corleone had all the judges, and the politicians in New York, then he must share them, or let us others use them. He must let us draw the water from the well. Certainly he can present a bill for such services; after all... we are not Communists.
Don Corleone: What have I ever done to make you treat me so disrespectfully? If you'd come to me in friendship, then this scum that ruined your daughter would be suffering this very day. And if by chance an honest man like yourself should make enemies, then they would become my enemies. And then they would fear you.
Tom Hagen: Mr. Corleone never asks a second favor once he's refused the first, understood?
Sollozzo: I don't like violence, Tom. I'm a businessman; blood is a big expense.
Michael: My father made him an offer he couldn't refuse.
Kay Adams: What was that?
Michael: Luca Brasi, held a gun to his head, and my father assured him, that either his brain or his signature would be on the contract.
Don Corleone: I'm a superstitious man, and if some unlucky accident should befall Michael - if he is to be shot in the head by a police officer, or be found hung dead in a jail cell... or if he should be struck by a bolt of lightning - then I'm going to blame some of the people in this room; and then I do not forgive. But with said, I pledge - on the souls of my grandchildren - that I will not be the one to break the peace that we have made today.