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Every state of rest can cease.
Rest means remaining in a location, yet the same body can later move. Therefore a current state of rest is not necessarily an unalterable eternal property. The possibility of cessation is used to support the claim that rest is originated.
An objection remains: “it can cease” is not identical to “it actually ceased.” Modal possibility, actual beginning, and observed end are different claims. Keeping them apart makes the argument more precise.