This is the strict theory of causality.
The idea is that things remain the same unless acted upon. The classic physics “A body in motion will remain in motion and a body at rest will remain at rest, unless they are acted upon by some force.”
There are problems with this theory, the decay of a radioactive atom is inconsistent with it, even though this is observed in experiments.
Perhaps if you described what aspect of the theory you’re having trouble understanding.
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