His soul was invisible, Robbie. You couldn't see it.
5 seconds sound clip from the Poltergeist (1982) movie soundboard.
You can hear this line at 00:57:02 in the Blu-ray version of the movie.
Quote context
[...]
- Your sister isn't dead, Robbie.
- If I got killed, could I visit her and show her how to get back here?
- Some people believe that when you die your soul goes to heaven.
- His soul was invisible, Robbie. You couldn't see it.
- But how come Grandpa isn't on television with Carol Anne?
- And then some people die, but they don't know that they've gone.
- They think they're still alive?
[...]