The empty vacuum is just another symbol that we use for illustration. Stay on the Path, and remain empty. All concepts are illusions, and eventually they fade away. Everything that is said about Heaven and Hell are only mental concepts. A change in thought changes the entire world.
All views are due to different mental concepts.
The six families of being perceive the world in different ways. The uninitiated see the external world as divided in two, dualistically. They see the teachings in the light of their own conceptions. As they see it, so it appears. Seeing things as manifold, they believe in separation, and are mistaken.