lol, first, the brain is a product of the universe, there has to be a universe before there can be a brain within the universe.
second, the ming houses thought, the ego observes thought by entering the mind, otherwise it is thoughtless nothing.
third, egos eventually become divine or demonic, both are fairly evenly matched, but the divine create the power of the demonic; demons use the physical to create, whereas the divine use mental to create.

the mental created the universe and all the brains within it lol and then decided to try and BECOME it's creations, using the human brain. it's a learning process of how to coexist within your own creations, and still retain your divinity. however we're thousands of times more prone to demonic corruption, due to our semi-natural ignorance.