Tom Hagen: I'm an attorney for the Corleone family. These men are private detectives hired to protect Vito Corleone. They are licensed to carry firearms. If you interfere you'll have to appear before a judge in the morning and show cause.
Michael: 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: Oh. Who's being naive, Kay?
Don Corleone: You talk about vengeance. Is vengeance going to bring your son back to you? Or my boy to me?
Calo: In Sicily, women are more dangerous than shotguns.
Sonny: Goddamn FBI don't respect nothin'.
Sollozzo: I don't like violence, Tom. I'm a businessman; blood is a big expense.