Here are some of the impactful quotes from the movies. Writing them down is a really an injustice to their greatness. They can really only be enjoyed while watching the movies:
The Godfather (Part 1):
Some day, and that day may never come, I'll call upon you to do a service for me. Until that day, accept this justice as a gift on my daughters wedding day".
"No Sicilian can refuse any request on his daughter's wedding day".
"I'm gonna make him an offer he can't refuse".
"But I'm a superstitious man. And if some unlucky accident should befall him - If he should get shot in the head by a police officer, or if he should hang himself in his jail cell - or if he's struck by a bolt of lightning, them I'm going to blame some of the people in this room, and that I do not forgive. But, that aside, let me say that I swear, on the souls of my grandchildren, that I will not be the one to break the peace we've made here today."
"Sonofabitch! Do you know who I am? I'm Moe Greene! I made my bones when you were going out with cheerleaders!"
"Fredo. You're my older brother, and I love you. But don't ever take sides with anyone against the Family again. Ever. "
You're finished. I'm putting you on a plane to Vegas . I want you to stay there. Understand? Only don't tell me you're innocent. Because it insults my intelligence, and makes me very angry".
"Keep your friends close, but your enemies closer"
"I know it was you Fredo. You broke my heart"
"Taken care of me! You're my kid brother and you're gonna take care of me!"
"Fredo. You're nothing to me now. You're not brother, you're not a friend. I don't wanna know you or what you do".
"If anything in this life is certain; If history has taught us anything. It say's you can kill anyone".