Nothing you have here on Earth can stop them.
5 seconds sound clip from the The Day the Earth Stood Still (1954) classic radio play.
You can hear this line at 00:51:01 in the radio play.
Quote context
[...]
- Where I come from, we believe there must be security for all... or no one is secure.
- This does not mean giving up any freedom except the freedom to act irresponsibly.
- This is the message that I ask you to take back when you return to your native lands.
- At the first sign of treachery, they will act automatically.
- Nothing you have here on Earth can stop them.
- The penalty for provoking their action is too terrible to risk.
- I'll remember, Mr. Carpenter.
- And, as they had seen him come, so did they see him depart.
[...]