It has been postulated by some philosophers that God is the Universe.
Theologians have claimed that God is unmovable by any force other than itself.
Of course it can move itself, as it is dynamic and said to be omnipotent.
There are certain basic properties however which in God never changes.
That it is eternal and infinite, for example, may never change. In that respect, it is immovable.
Therefore if God is the universe, i.e. Reality itself, if anything had power to change it, everything -- reality as we experience it, perhaps even all consciousness -- would cease to exist.
There would be nothing left, only Death.
Therefore it must be immovable by anything other than the totality of itself. That is why it is called the immovable mover.
That is not to say that it cannot respond to acts of freewill, by humans for example.
Let us imagine hypothetically that humans decide to destroy their own habitation, Earth. Whether or not they succeed, the Universe will be affected by and will respond to such activity.
But although humans may be able to destroy the Earth, the Sun, the Moon, our own solar system, galaxy, and even ourselves as a species, we cannot destroy the Universe, no matter how hard some may try.
Meanwhile the universe can and does have freedom to move (or change) itself. Perhaps it expands and contracts like an enormous heartbeat, producing (or creating) "Big Bangs" and "Black Holes" and "galaxies" and other interesting phenomena.
Surely God can quite easily heal itself and recover from any and all assaults on it by certain members of the human species who, whether intentionally or foolishly, choose to destroy themselves and others.
And if not, then eventually everything would simply cease to exist and be replaced by death or nothingness.
An idea which unfortunately doesn't seem to bother some people.
However Justice (universal justice) is supposed to prevent that from happening, suggesting that if it indeed cannot happen -- if nothing can destroy the universe -- then God really is the immovable mover.