It's no use. He knows it's your other self.
6 seconds sound clip from the Forbidden Planet (1956) movie soundboard.
You can hear this line at 01:30:27 in the Blu-ray version of the movie.
Quote context
[...]
- She's joined herself to me. Body and soul.
- Yes, and whatever comes, forever.
- Say it's a lie. Let it hear you out there. Tell it you don't love this man.
- Stop it, Robby. Don't let it in. Kill it, Robby.
- It's no use. He knows it's your other self.
- Why did you jumble that combination?
- Whatever you know in here, your twin self out in the tunnel knows too.
- We're all part monsters in our subconscious, so we have laws and religion.
[...]