The saying goes "If the Nothing is alive, it is sleeping". Our Oldest Parent began to live thanks to the Nothings random happenings. It is easy to have an emotional attachment to the Nothing, as it gave us God, ourselves, and many wealths.
So what is the Nothing? It has become quickly understood as outer space.
To put it in complex terms, it is a dimensional structure that began growing as a centralized area, having friction upon itself, thus expanding sphereically.
Want a visual look at it? Take a sheet of white paper and a pencil. Make a dot at the center of the page. Draw a line through the middle of the dot. That dot represents the Nothing. It had two sides that frictioned upon each other (the line), causing swelling (growth).
It stretched outward towards areas made of a similar such as that dot. Basically the dot represents the Nothing, and outside the dot, where the dot is stretching too, is a similar finding.
The Nothing's friction burned hot causing solid and liquids, even halfs like "Fire" to be possible. Fire was mentioned in the book "Existence Hollowed", fire is old, linked to the Nothings friction, and later on, was extracted from dissolving solid matter.
I should note, there are a lot of things available in the Nothing nowadays, but it is also true, they get reused quite often. So if you notice fire as being an important factor throughout history, its because its a primal happening with the Nothing that has many uses.