Nothing has existed before the Universe came into existance, nothing is the space the universe occupies, without nothing the universe is non existant.
How do you know nothing didn't exist until we though of the concept resulting in the universe creating it out of the thought.
Because nothing was here before we existed
So you think thoughts can manifest themselves in the space that nothing presumably occupies?
since nothing does exist, nothing can manifest thoughts, and those thoughts would be of everything.