we can't know if there's something outside our minds because if we see and sense something it's in our consciousness, in our mind, otherwise we coulnd't be consicous of it.
Likewise if there was nothing outside our minds there would be nothing to be concious of. I forget the title (again) for people who believe nothing exists outside their own mind, but I prefer to call them insane.
No communication could be done between this soul and world of us.
Then how do you know such a thing exists?
Here we have c7ity saying things that do exist don't exist and Liveinfaith saying things exist that don't exist...
You can't win.