As Tom Hanks says in the flick "You've Got Mail," The Godfather is the I Ching of modern mankind. There are so many quotes that resonate, it has become almost like Shakespeare. I have read the positings on this topic, and I agree with everyone, so I will choose a few different ones which I do not think have been posted on this thread.

Godfather I - "Call Bonasera -- we need him now."

""How's the Eye-talian food in this place?"
"Try the veal. Its the best in the city."

"You spoiled Guinea brat!"

GFII - "And that kid's name was Moe Green."

"Vito Andolini --- and this is for you!"

"Its hard being a son, Fredo."

GFIII - "I'll give you a hint....he's an Italian."

"Our ships must sail in the same direction."

"Take a train to Rome....light a candle for the Archbishop."