You will not see us until it is time.
4 seconds sound clip from the It Came from Outer Space movie soundboard.
You can hear this line at 00:57:42.998 in the Blu-ray version of the movie.
Quote context
[...]
- Let me see you as you really are.
- What do you want? What are you doing?
- We are repairing our ship to leave your world. We need your help.
- You ask me to help you. How can I, when you've kidnapped and stolen? For all I know, even murdered.
- We have a long way to go. By nightfall, we will have left your Earth.
- You will not see us until it is time.
- Time for what? Time to kill? Time to take over?
- We have souls and minds, and we are good.
- We are not yet ready to meet in friendship.
- Why not?
- Because you would be horrified at the sight of us.
- Had you fallen on our world, it might have been different. We understand more.
[...]