And tell me the truth, Tom, how many men do you figure the Don killed or had killed."
Tom Hagen turned away. "I'll tell you one thing you didn't learn from him: talking the way you're talking now. There are things that have to be done and you do them and you never talk about them. You don't try to justify them. They can't be justified. You just do them. Then you forget it."

Michael Corleone frowned. He said quietly, "As the Consigliere, you agree that it's dangerous to the Don and our Family to let Sollozzo live?"
"Yes," Hagen said.
"OK," Michael said. "Then I have to kill him."