Here are some of the famous lines delivered by Don Corleone (Brando) to his protegee Irish son (Duvall).
Don Corleone: Give me a drop.
[Hagen hands the Don his glass of anisette]
Don Corleone: My wife is crying upstairs. I hear cars coming to the house.Consigliore of mine, I think it's time you told your Don what everyone seems to know..
Tom Hagen: I didn't tell Mama anything. I was just about to come up and wake you so that I could tell you.
Don Corleone: But you needed a drink first.
Don Corleone: And now you've had your drink.
Tom Hagen: They shot Sonny on the causeway. He's dead.
[the Don accepts this news without any sign of emotion,
except to close his eyes and remain silent for a few minutes]
Don Corleone: [speaking at last] I want no inquiries made.
I want no acts of vengeance.I want you to arrange a meeting
with the heads of the Five Families. This war stops now.