Scientists have assigned the role of Mister Answer to science, the source of knowledge on every subject. This is peculiar because science does not accept a complete body of knowledge at any one time as final, therefore no answer can be final. This is how science progresses. Scientists, though, often forget that.
Reality is waiting for us to creep closer to understanding its mysteries. In the meantime, it won't falter or come to an end. Reality will remain our home, our source, and the ground state of our being far beyond the lifetime of the foreseeable universe.
Asking the brain to understand where reality comes from is like asking a robot to dismantle itself to find out what it's made of -- you won't have a machine after the dismantling is done, and therefore no answer.