Accidents don't happen to people who take accidents as a personal insult.

The other Dons in the room applauded and rose to shake hands with everybody in sight and to congratulate Don Corleone and Don Tattaglia on their new friendship. It was not perhaps the warmest friendship in the world, they would not send each other Christmas gift greetings, but they would not murder each other. That was friendship enough in this world, all that was needed.

Revenge is a dish that tastes best when served cold.

No, that's not possible," Michael said. "Killed, yes; jail, no.

there was no greater natural advantage in life than having an enemy overestimate your faults, unless it was to have a friend underestimate your virtues.

Some honorable men spend their whole life preparing for a supreme act of treachery

Any man can turn traitor.