That divine simplicity entails modal collapse is a controversial thesis, but one for which there are strong arguments. Does the same hold for divine immutability? I don't think so. That immutability should entail modal collapse strikes me as based on a simple confusion of the temporal with the modal.
Modal Collapse
In the state of modal collapse, there are no contingent propositions, where a contingent proposition is one that is possibly false if true, and possibly true if false, and where there are no contingent beings, where a contingent being is one that is possibly nonexistent if existent and possibly existent if nonexistent. So in the dreaded state of modal collapse, every proposition is either necessarily true or necessarily false, and every being is either necessary or impossible.
Although one philosopher's datum is often another's (false) theory, I take it to be a datum, a Moorean fact, that, for example, I exist contingently and that many of the propositions about me are contingently either true or false. For example, it is contingently true that I am now blogging, and contingently false that I am now riding my bike, where 'now' picks out the same time.
I take it, then, that we should want to uphold the modal distinctions and that it is an argument against a theory if it should fail to do so.
Divine Immutability
In a strong form, the immutability doctrine states that God does not undergo any sort of intrinsic change. We distinguish intrinsic from relational changes. If Hillary becomes furious at Bill's infidelity, that is an intrinsic change in her. But there needn't be any corresponding intrinsic change in Bill. He will change, but relationally by becoming the object of Hillary's wrath. (And perhaps only relationally if Bill is unaware of Hillary's discovery of his infidelity and the onset of her wrath.) If, however, her rage should vent itself in her conking him on the head with a rolling pin, then intrinsic changes will occur in both parties to this famous marriage.
Similarly, if I start and stop thinking about God, I undergo an intrinsic change, but this intrinsic change in me is a merely relational ('merely Cambridge') change in God, and is insofar forth compatible with God's strong immutability.
Strong immutability, then, is the claim that God is not subject to intrinsic change.
Confusing the Temporal with the Modal
If God is strongly immutable, then any intrinsic property that he has at a given time he has at every time. But if a thing has a property at every time at which it exists, it does not follow that it has that property necessarily. I'm a native Californian. I always was and I always will be. But that is a contingent fact about me: I might have been born in some other state. So the property of being born in California is one I have contingently despite my having it at every moment of my existence. The same goes for intrinsic properties. Suppose the universe always existed and always will exist. That is consistent with the universe's being contingent. What is always the case needn't necessarily be the case.
Now suppose God always wills the existence of our universe. It does not follow that God necessarily wills the existence of our universe. Nor does it follow that what he wills-- our universe -- necessarily exists. This consideration puts paid to the threat of modal collapse. Tim Pawl in his IEP article puts it like this:
Divine immutability rules out that God go from being one way to being another way. But it does not rule out God knowing, desiring, or acting differently than he does. It is possible that God not create anything. If God hadn’t created anything, he wouldn’t talk to Abraham at a certain time (since no Abraham would exist). But such a scenario doesn’t require that God change, since it doesn’t require that there be a time when God is one way, and a later time when he is different. Rather, it just requires the counterfactual difference that if God had not created, he would not talk to Abraham. Such a truth is neutral to whether or not God changes. In short, difference across possible worlds does not entail difference across times. Since all that strong immutability rules out is difference across times, divine immutability is not inconsistent with counterfactual difference, and hence does not entail a modal collapse. Things could have been otherwise than they are, and, had they been different, God would immutably know things other than he does, all without change . . . .
Three Theses
First, the divine simplicity doctrine entails modal collapse. This was argued earlier.
Second, divine simplicity is not to be confused with divine immutability. The first entails the second, but the second does not entail the first.
Third, divine immutability does not entail modal collapse.
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