Two theories of divine conservation

Here are two theories of divine conservation, tendentiously labeled:

• Occasionalist conservation: That a creature that previously existed continues to exist is solely explained by God’s power.

• Concurrentist conservation: That a creature that previously existed continues to exist is explained by God’s power concurring with creaturely causal powers (typically, the creature’s power to continue to exist).

It is usual in classical theism to say that divine conservation is very similar to divine creation. This comparison might seen to favor occasionalist conservation. However, that is not so clear once we realize that classical theism holds that all finite things are created by God, and hence creation itself comes in two varieties:

• Creation ex nihilo: God creates something by the sole exercise of his power.

• Concurrentist creation: God creates things by concurring with a creaturely cause.

Most of the objects familiar to us are the product of concurrentist creation. Thus, an acorn is produced by God in concurrence with an oak tree, and a car inconcurrence with a factory. (The human soul is an exception according to Catholic tradition.)

Because of this, even if we opt for concurrentist conservation, we can still save the comparison between conservation and creation, as long as we remember that often creation is concurrentist creation.

Which of the two theories of conservation should we prefer?

On general principles, I think we have some reason to prefer concurrentist conservation, simply because it preserves the explanatory connections within the natural world better.

However, if we insist on presentism, then we may be stuck with occasionalist conservation, because presentism makes cross-time causal relations problematic.

[Edited Nov. 4 2020 to replace "cooperation" with the more usual term "concurrence".]

Things God can't cause

It is widely held by Thomists that anything that a creature can cause can be caused directly by God without any creaturely involvement. Now suppose Sam thinks the following thought:

1. All my thoughts are caused in part by me.

But if God directly causes thought (1) in Sam, then God will directly be causing Sam to think a falsehood (since it will be false that all of Sam’s thoughts are caused in part by Sam). This seems contrary to divine truthfulness.

In an earlier post, I suggest that the Thomist retreat to the principle that for anything a creature can cause, God can directly cause something qualitatively identical to it. But that won't help with this problem, since anything qualitatively identical to (1) but caused directly by God will be false.

I suppose the Thomist can make a similar move here to the one Thomas makes when he says that God can do evil in the sense that he has the power to do it, but not the will. So we would deny that it is possible for God to directly cause anything that a creature can (since God’s goodness rules out God’s causation of some such things), but affirm that he has the power to do so.

Causation and Thomism

Assume a Thomistic metaphysics, including the primary/secondary causation model from Aquinas. Thus, whenever a created cause has an effect, it has the effect it does only because God, through primary causation, cooperates with the created cause. If God did not cooperate with the created cause, the creature’s secondary causal power would be impotent to produce the effect. On the other hand, God can directly cause something by primary causation without the secondary causes doing anything.

Suppose that I strike a match, but God doesn’t cooperate in the frictional causing of fire. Then the match is struck, and does everything a struck match does, except that no fire results. Now imagine these two scenarios:

1. I strike a match which, in the ordinary way and with God’s cooperation, causes fire.

2. I strike a match, but God does not cooperate with me; however, God miraculously causes a fire just like the one in (1).

These two scenarios are different. So they must differ in something. They cannot differ in God, since that would violate divine simplicity, a core commitment of Thomistic metaphysics. So they must differ on the side of creatures. If so, they differ in the match striking or in the fire (or, more precisely, in the match and in that which is on fire, given a substance-accident ontology), God’s cooperation or lack thereof making the match-striking or the fire different.

Suppose God’s cooperation makes the match-striking different. Then in scenario (1), created reality includes the event of divinely-cooperated-match-striking. This event surely doesn’t need any further divine cooperation, or else we’d have a regress. But no item in created reality is sufficient on its own to produce an effect witout God’s cooperation being added to it on the primary/secondary causation model.

So, it is the fire that must be made different by God’s cooperation. In scenario (1), the fire is caused by the match and God while in (2), it is caused by God alone, and that makes the fire different between the scenarios. I would like to say that the esse of the fire is different in the two cases: in the ordinary case its esse is at least in part being caused by the match with God’s cooperation while in the other case the match doesn’t enter into its esse. But the details don’t matter for this post: what matters is that the fire is different between scenarios (1) and (2).

But this has an unfortunate consequence: If the fire must be different in some metaphysical way in cases (1) and (2), it follows that God cannot directly and independently of creation cause the same effect as the match caused. And this violates the Thomistic principle that whatever a finite cause suffices for can be produced by God directly. God cannot directly produce a fire-caused-by-the-match; that would be a contradiction.

So we have a conflict between a number of Thomistic principles:

3. Divine simplicity

4. Divine omnipotence

5. The primary/secondary causation model

6. God can directly cause anything he can cause in cooperation with a creature.

It seems to me that 3-5 are more central to Thomism than 6. So, I am inclined to reject 6, perhaps replacing it with the weaker principle that for any item x that God can cause in cooperation with a creature, God can cause an item x^* which is qualitatively just like x.

Perhaps I was too quick when I said that (1) and (2) must differ in the match or the fire. Perhaps they differ in something “in between” the match and the fire, a token causal relation. I think this is a problematic solution for two reasons. First, it is central to Aristotelianism that all that exists are substances and their accidents. The token causal relation, if it’s not “in” any creature, would violate this. Second, it seems that the match strike plus this “in between” thingy are now sufficient to produce the fire, or else we can run the above argument with the match strike and the “in between” thingy in place of the match strike. But no mere creature is sufficient to produce an effect without God’s cooperation.

God, probabilities and causal propensities

Suppose a poor and good person is forced to flip a fair and indeterministic coin in circumstances where heads means utter ruin and tails means financial redemption. If either Molinism or Thomism is true, we would expect that, even without taking into account miracles:

1. P(H)<P(T).

After all, God is good, and so he is more likely to try to get the good outcome for the person. (Of course, there are other considerations involved, so the boost in probability in favor of tails may be small.)

The Molinist can give this story. God knows how the coin would come out in various circumstances. He is more likely to ensure the occurrence of circumstances in which the subjunctive conditionals say that tails would comes up. The Thomist, on the other hand, will say that God’s primary causation determines what effect the secondary creaturely causation has, while at the same time ensuring that the secondary causation is genuinely doing its causal job.

But given (1), how can we say that the coin is fair? Here is a possibility. The probabilities in (1) take God’s dispositions into account. But we can also look simply at the causal propensities of the coin. The causal propensities of the coin are equibalanced between heads and tails. In addition to the probabilities in (1), which take everything including God into account, we can talk of coin-grounded causal chances, which are basically determined by the ratios of strength in the causal propensities. And the coin-grounded causal chances are 1/2 for heads and 1/2 for tails. But given Molinism or Thomism, these chances are not wholly determinative of the probabilities and the frequencies in repeat experiments, since the latter need to take into account the skewing due to God’s preference for the good.

So we get two sets of probabilities: The all-things-considered probabilities P that take God into account and that yield (1) and the creatures-only-considered probabilities P_c on which:

2. P_c(H)=P_c(T)=1/2.

Here, however, is something that I think is a little troubling about both the Molinist and Thomist lines. The creatures-only-considered probabilities are obviously close to the observed frequencies. Why? I think the Molinist and Thomist have to say this: They are close because God chooses to act in such ways that the actual frequencies are approximately proportional to the strengths of causal propensities that P_c is based on. But then the frequencies of coin toss outcomes are not directly due to the causal propensities of the coin, but only because God chooses to make the frequencies match. This doesn’t seem right and is a reason why I want to adopt neither Molinism nor Thomism but a version of mere foreknowledge.

Thomism, chance and cooperative providence

Thomists have two stories about how God can act providentially in the world. First, God can work simply miraculously, directly producing an effect that transcends the relevant created causal powers. Second, God can work cooperatively: whenever any finite causal agency is exercised, God intentionally cooperates with it through his primary causation, in such a way that it is up to God which of the causal agents natural effects is produced.

I think there is a difficult problem for cooperative divine agency. Suppose Alice is desperate for food for her children. She finds an indeterministic alien device which has the following property. If she presses the big button on it, the machine has probability 1/2 of producing enough food for a month for her family, and probability 1/2 of giving her a mild shock and turning off for a month.

Alice says a quick but sincerely prayer and presses the button. Then, presumably:

1. The probability that the machine will produce food is 1/2 conditionally on God not working miraculously.

But now notice:

2. Necessarily, if God does not work miraculously, the machine will produce food if and only if God intentionally connaturally cooperates with the machine to produce food.

From (1) and (2) we can conclude:

3. The probability that God will intentionally cooperates with the machine to produce food is 1/2 conditionally on God not working miraculously.

But imagine a different machine, where pressing the button has probability 1/2 of producing enough round pizza for a week and probability 1/2 of producing enough square pizza for a week. If Alice pressed the button on that machine, God, in acting cooperatively, would not have any significant reason to make the output of the machine come out one way or another.

In the round-or-square-pizza machine, we would expect the probability that God would cooperate to produce a particular outcome to be 1/2. But in the food-or-nothing machine, God does have a good reason to make the output of the machine be food: namely, God loves Alice and her family. We would expect the statistics for divine intentional cooperation to be different in the case of the two machines. But they are the same. In other words, it seems that God’s cooperative providence cannot depart from the statistics built into the natures of creatures. Yet that providence is fully under God’s voluntary control according to Thomism. This is puzzling.

If the Thomist says that God’s special providence is always exercised miraculously rather than cooperatively, the problem disappears. Absent special providential reasons, God has reason to follow the natural statistics of the machines. But if we allow that God sometimes exercises his special providence cooperatively, that should skew the statistics, and it cannot do that given the argument from (1) and (2) to (3).

Restricting special providence to miracles is a real option, but it destroys one of the advantages that Thomism has over competing theories.