Klaatu:
"[after reading the Gettysburg Address at the Lincoln Memorial] Those are great words. He must have been a great man."
Bobby Benson:
"Well sure."
Klaatu:
"That's the kind of man I would like to talk to."
Bobby Benson:
"[to Klaatu]
I like you Mr. Carpenter, you're a real screwball!"
Bobby Benson:
"[at a visit to Arlington Cemetery] That's my father. He was killed at Anzio."
Klaatu:
"Did all those people die in wars?"
Bobby Benson:
"Most of 'em. Didn't you ever hear of the Arlington Cemetery?"
Klaatu:
"No, I'm afraid not."
Bobby Benson:
"You don't seem to know much about anything, do you, Mr. Carpenter?"
Klaatu:
"Well, I'll tell you, Bobby, I've been away a long time. Very far away."
Bobby Benson:
"Is it different where you've been? Don't they have places like this?"
Klaatu:
"Well, they have cemeteries, but not like this one. You see, they don't have any wars."
Bobby Benson:
"Gee, that's a good idea."
Klaatu:
"I am fearful when I see people substituting fear for reason."
Barnhardt:
"One thing, Mr. Klaatu: suppose this group should reject your proposals. What is the alternative?"
Klaatu:
"I'm afraid there is no alternative. In such a case, the planet Earth would have to be... eliminated."
Barnhardt:
"Such power exists?"
Klaatu:
"I assure you, such power exists."
Klaatu:
"You have faith, Professor Barnhardt?"
Barnhardt:
"It isn't faith that makes good science, Mr. Klaatu, it's curiosity. Sit down, please. There are several thousand questions I'd like to ask you."
Helen:
"I thought you were..."
Klaatu:
"I was."
Barnhardt:
"Have you tested this theory?"
Klaatu:
"I find it works well enough to get me from one planet to another."
Helen:
"Gort! Klaatu barada nikto!"
Klaatu:
"I won't resort to threats, Mr. Harley. I merely tell you the future of your planet is at stake."
Klaatu:
"We have come to visit you in peace and with goodwill."
Mr. Harley:
"Your impatience is quite understandable."
Klaatu:
"I'm impatient with stupidity. My people have learned to live without it."
Mr. Harley:
"I'm afraid my people haven't. I'm very sorry... I wish it were otherwise."
Klaatu:
"I'm worried about Gort. I'm afraid of what he might do if anything should happen to me."
Helen:
"Gort? But he's a robot. Without you, what could he do?"
Klaatu:
"There's no limit to what he could do. He could destroy the Earth."
Klaatu:
"Klaatu barada nikto!"