But the eternal had to change (become temporal) in order to create the temporal. If the eternal is creating then it is not resting. That's why I said the world would have to exist eternally for the eternal to remain unchanging.
For a somewhat analog, consider the laws of physics. They don’t “rest” when a reaction stops
Gravity did not pre-exist matter. It "rests" when the matter is gone.
But the laws of physics do not. And they do not change when matter exists or doesn't.