Vincent Mancini: Don Lucchesi, you are a man of finance and politics. These things I don't understand.
Don Lucchesi: You understand guns?
Vincent Mancini: Yes.
Don Lucchesi: Finance is a gun. Politics is knowing when to pull the trigger.

[In the helicopter.]
Vincent Mancini: I'd like to take Joey Zaza up in one of these and drop him.

Michael Corleone: Just when I thought that I was out they pull me back in.

[narrating letter to his children at opening of movie]
Michael Corleone: "The only wealth in this world is children. More than all the money, power on the earth."

Michael Corleone: Never hate your enemies. It affects your judgment.

Michael Corleone: Never let anyone know what you are thinking.

Michael Corleone: When they come...they come at what you love.

Michael Corleone: Treachery is everywhere.

Michael Corleone: Your enemies always get strong on what you leave behind.

Michael Corleone: The higher I go crookeder it becomes.

Michael Corleone: He'd better be careful. It's dangerous to be a honest man.

[After the cardinal hears Michael's confession.]
Cardinal Lamberto: Your sins are terrible. It is just that you suffer.

Don Altobello: The richest man is the one with the most powerful friends.

Michael Corleone: Kay, I had a very different destiny planned for us.

Michael Corleone: Do you still fear me Kay?
Kay Corleone: I don't fear you Michael, I just dread you.