[Rehearsing a speech.]
Luca Brasi: Don Corleone, I am honored and grateful that you have invited me to your house on the day of your daughter's wedding.

[Delivering his rehearsed speech.]
Luca Brasi: Don Corleone, I am honored and grateful that you have invited me to your daughter... 's wedding... on the day of your daughter's wedding. And I hope their first child be a masculine child. I pledge my ever-ending loyalty.

[After Michael gets off the phone with Kay, clearly too embarrassed to tell her "I love you too."]
Clemenza: Mikey, why don't you tell that nice girl you love her? "I love you with all-a my heart, if I don't see-a you again soon, I'm-a gonna die..."

Sonny: Goddamn FBI don't respect nothin'.

Fabrizio: In Sicily, women are more dangerous than shotguns.

Sonny: I want someone good, I mean very good, to plant that gun. I don't want my brother coming out of the bathroom with just his dick in his hands.

Michael Corleone: My father is no different than any powerful man, any man with power, like a president or senator.
Kay Adams: Do you know how naive you sound, Michael? Presidents and senators don't have men killed!
Michael Corleone: Oh. Who's being naive, Kay?

Jack Woltz: Johnny Fontane never gets that movie! That part is perfect for him, it'll make him a big star, and I'm gonna run him out of the business, and let me tell you why. Johnny Fontane ruined one of Woltz International's most valuable proteges. For five years we had her under training. Singing lessons, acting lessons, dancing lessons. I spent hundreds of thousands of dollars on her, I was gonna make her a big star! And let me be even more frank, just to show you that I'm not a hard-hearted man, and that it's not all dollars and cents. She was beautiful! She was young! She was innocent! 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!

Woltz: Now you listen to me, you smooth talking son-of-a-bitch! Let me lay it on the line for you and your boss, whoever he is. Johnny Fontane willl never get that movie! I don't care how many dago guinea wop greaseball goombahs come out of the woodwork!

Bonasera: I believe in America. America has made my fortune.

Michael Corleone: That's my family, Kay. It's not me.

Don Corleone: Do you spend time with your family? Good. Because a man that doesn't spend time with his family can never be a real man.

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.

[Luca Brasi's bulletproof vest is delivered, wrapped around a fish.]
Pete Clemenza: It's a Sicilian message. It means Luca Brasi sleeps with the fishes.

Tessio: Can you get me off the hook, Tom? For old times' sake?
Tom Hagen: Can't do it, Sally.

Don Corleone: Tattaglia's a pimp. He never could've out-fought Santino. But I didn't know until this day that it was Barzini all along.

Don Corleone: I spent my whole life trying not to be careless. Women and children can be careless. But not men.

Tom Hagen: You know how they're going to come at you?
Michael Corleone: They want to arrange a meeting between me and Barzini. On Tessio's ground. Where I'll be safe.

Don Corleone: You talk about vengeance. Is vengeance going to bring your son back to you? Or my boy to me?

Don Corleone: I never thought you were a bad consiglieri, Tom. I thought Santino was a bad don, rest in peace.

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.

Don Corleone: I like to drink wine more than I used to.
Michael Corleone: It's good for ya, Pop.
Don Corleone: Anyway I'm drinkin' more.

Tom Hagen: Mr. Corleone never asks a second favor once he's refused the first, understood?

Clemenza: Leave the gun. Take the cannoli.

[After being asked how he will arrange to buy a hotel from Moe Greene]
Michael Corleone: I'll make him an offer he can't refuse.

[Speaking with the father of the girl he plans to marry, and after telling him that he's in hiding from some gangsters]
Michael Corleone: Some people will pay a lot of money for that information, but then your daugther would lose a father, instead of gaining a husband.

Michael Corleone: Fredo, you're my older brother and I love you, but don't ever take sides with anyone against the family again. Ever.

Sonny: Hey, whataya gonna do, nice college boy, eh? Didn't want to get mixed up in the Family business, huh? Now you wanna gun down a police captain. Why? Because he slapped ya in the face a little bit? Hah? What do you think this is the Army, where you shoot 'em a mile away? You've gotta get up close like this and bada-bing! you blow their brains all over your nice Ivy League suit. C'mere..
[kisses Michael's head]
Michael Corleone: Sonny...
Sonny: You're taking this very personal. Tom, this is business and this man is taking it very personal.