Once you understand you'll be grateful.
3 seconds sound clip from the Invasion of the Body Snatchers (1956) movie soundboard.
You can hear this line at 00:58:46.265 in the Blu-ray version of the movie.
Quote context
[...]
- Miles, it would have been so much easier if you'd gone to sleep last night.
- Now relax, we're here to help you.
- Where do you want us to put them?
- Would you like to watch them grow?
- There's nothing to be afraid of. We're not going to hurt you.
- Once you understand you'll be grateful.
- Remember how Teddy and I fought against it? We were wrong.
- You mean, Teddy doesn't mind?
- Of course not. She feels exactly the way I do.
- We'll leave town. We won't come back.
- We can't let you go. You're dangerous to us.
[...]