Vallicella on hylemorphic dualism, Part III

Bill Vallicella and I have been debating Aquinas’s hylemorphic dualism (HD).  Earlier posts (here, here, here, and here) have focused on Aquinas’s motivations for combining hylemorphism and dualism.  As we continue Bill and Ed’s Excellent Adventure, the discussion turns to questions about the internal coherence of the view.  In a new post, Bill summarizes what he takes to be one of the main problems with HD.  Give it a read, then come back.

Some questions on the soul, Part I

In a recent post I spoke of the soul after death as essentially the human being in a “radically diminished state.”  The Aristotelian-Thomistic philosophical reasons for this characterization were set out in an earlier post.  A reader asks how I would “answer [the] challenge that it appears the Bible suggests our souls in communion with God are better off than those of us here alive in this ‘vale of tears.’”  After all, St. Paul says that “we would rather be away from the body and at home with the Lord,” and Catholics pray to the saints, who are obviously in a better state than we are.  Isn’t this clearly incompatible with the claim that the soul after death is in a “radically diminished state”?  Furthermore, wouldn’t the conscious experiences that Christian doctrine attributes to the saved and the damned after death be metaphysically impossible on an Aristotelian-Thomistic conception of the soul?  Wouldn’t a Cartesian view of the soul be more in harmony with Christianity?  Do we have here a case “where Aristotelian philosophy is just at odds with revealed Christian truth”?

Plato’s affinity argument

In an earlier post I suggested that the arguments of great philosophers of the past need to be understood, not only in the context of their times, but also in light of how later thinkers built on them. For an argument can contain, inchoately, real insights which only later thinkers were able to spell out adequately; and we will miss these insights if, overly fearful of anachronism, we insist pedantically on reading the argument in isolation from this later tradition. What ultimately matters in philosophy is not exactly who said exactly what, exactly when and exactly how. What matters is what is true, and whether an argument is likely to lead us to it. Anachronism, then, while a danger, is a less serious danger than loss of truth. To think otherwise is to abandon philosophy for mere scholarship. (Scholarship has its place, of course. But its place is to serve the ends of philosophy.)

What immediately prompted that post were some reflections on Plato’s Phaedo, on which I had been lecturing at the time. The Phaedo is famously concerned with the immortality of the soul, and Socrates is represented as putting forward four main lines of argument in its defense – or rather, as commentators these days often emphasize, four sub-arguments in the course of what should be understood as a single long, complex argument. Modern readers of the Phaedo often dismiss the arguments as manifestly bad. David Stove, in The Plato Cult, describes them as “so contemptible that, on their own merits, they could hardly ever have imposed upon a child of eight” (pp. 100-1). This sort of judgment is, I think, completely unwarranted. When understood both in the context of Plato’s philosophy as a whole and in light of the ongoing classical tradition of thinking about the soul which Plato inaugurated, his arguments can be seen to be very interesting indeed. That is not to say either that Plato’s arguments are adequate as they stand or that all of them can at the end of the day be defended. It is to say instead that the arguments embody serious considerations in favor of the soul’s immortality, and that at least some of these considerations were developed by later writers into more complete and compelling arguments. Modern readers often fail to see this because – as with their treatment of Aquinas’s Five Ways – they too frequently lack familiarity with the metaphysical presuppositions of the arguments, and read into them modern assumptions which classical writers did not make and often would have rejected.

The four arguments in question are usually labeled the cyclical argument, the recollection argument, the affinity argument, and the final argument. Let us begin by briefly surveying the arguments. It is evident from the dialogue that the cyclical and recollection arguments are intended to work in tandem. Putting aside the details of the examples Socrates uses in stating them (e.g. the long discussion about the Form of Equality) we might summarize the case that these first two arguments are together intended to make as follows:

1. We have knowledge (of Forms and of mathematical truths) that could not have come from sensory experience or in any other way been learned during this life.

2. So it must have been acquired during an existence prior to this one.

3. So our souls must have pre-existed their embodiment in this life.

4. But things arise out of their opposites in a cyclical pattern, such as sleeping from waking and waking from sleeping.

5. So, just as souls pre-exist their embodiment during life, so too must they continue on disembodied after death.

One way this line of reasoning might be challenged is via the suggestion that even if our souls pre-existed this life, perhaps their embodiment has altered them to such an extent that they will not survive our deaths, the “cycle” being thereby broken. Answering such an objection seems to be the point of the affinity argument, the core of which might be summarized as follows:

1. The soul knows the Forms, which are eternal, whereas the senses know material things, which pass away.

2. But each of these faculties is like the thing it knows (e.g. the senses are material, the soul is invisible).

3. Thus it is because the senses are like the things they know that they too pass away.

4. So the soul, since it is like the Forms that it knows, must not pass away.

Following Socrates’ presentation of the affinity argument in the Phaedo, his interlocutors Simmias and Cebes raise some further objections, including Simmias’s famous suggestion that the soul may be a mere harmony or attunement of the body’s components, like the harmony of a lyre. This begins a long discussion which culminates in the final argument, which might be summarized as follows:

1. The soul is the principle by which a thing is alive.

2. So it participates in the Form of Life.

3. But a thing cannot participate in contrary Forms (e.g. fire, which participates in the Form of Hot, cannot participate in the Form of Cold).

4. So the soul cannot participate in the Form of Death.

5. So the soul cannot perish.

Now I have no intention of exploring each of these arguments in any detail. Indeed, the line of reasoning enshrined in the combination of the cyclical and recollection arguments is one which I – as a Thomist who takes the soul to be the form of the body – do not think can succeed at the end of the day. One obvious objection to it is that its first premise is false if (as I would maintain) an Aristotelian analysis of concept formation is correct. Another is that step 2 doesn’t follow from step 1 all by itself: Even if our knowledge of forms and of mathematical truths cannot have come from the senses, it may be that it was stamped into our intellects by God when He created our souls (as per a rationalist theory of innate ideas) or that it results from a kind of divine illumination (as per St. Augustine). And of course, the stuff about things arising out of their opposites needs to be tightened up, to say the least. All the same, I’m sure a serious Platonist could give the argument a run for its money, and it would be a useful philosophical exercise to see how far it could be defended against objections. Much farther than most contemporary readers would suppose, I would bet.

Anyway, it is the second two arguments that I think are the most interesting. In the case of the final argument, this is not because it is sufficient to establish personal immortality. It is not. But what it does do, it seems to me, is foreshadow the Aristotelian-Thomistic insight that while particular composites of matter and form – that is, individual material substances – are generated and pass away, form itself (and thus the soul) is not susceptible of perishing. For a material substance’s perishing just amounts to its matter losing its form, and a form can’t coherently be said to lose its form (because it is a form). But then, since the soul is (on the A-T analysis) just a kind of form, the soul is not susceptible of perishing.

The reason this does not by itself establish personal immortality is that the forms of material things, considered by themselves, are in general mere abstractions. What exist concretely are individual material substances, and thus form and matter together. For this reason, matter too, considered apart from form, is a mere abstraction – speaking concretely, matter always exists with some form or other. And thus, if the soul qua form were imperishable merely in the sense just described, it would be no more imperishable than matter is. As Aquinas says in On the Principles of Nature, “prime matter [i.e. matter without form], and even form, are neither generated nor corrupted… properly speaking, only composites are generated” (2.15). A thing’s matter carries on after its destruction in the sense that the matter simply takes on a new form; its form carries on in the sense that some new substance with the very same form can always come into being. It is only the individual concrete substance that the form and matter together compose which comes into being and passes away. Since it passes away, though, the survival of its form – its soul, in the case of a living thing – merely qua something which another, future substance might take on, does not entail that the substance itself survives in any sense. When a particular rose bush dies, its form carries on in the sense that new rose bushes can always come into being, but that rose bush is gone for good.

For the imperishability of the human soul to ensure personal immortality, then – the survival not merely of the abstract form of man, but of your form or soul specifically – it would have to be what the forms of other material things in general are not: a kind of subsistent form, something whose operations are not, or at least are not entirely, dependent on matter. That is to say, it would have to be something which operates as a kind of immaterial particular thing even when it informs the matter of the body. Only then would its survival count as the survival of the particular human being whose soul it was. Or rather, it would count as the survival of the chief part of that particular human being; for the whole human being to come back into existence, the soul would have to be reunited with the matter that made up its body, which in Aquinas’s view it does at the resurrection. But the survival of the soul as a kind of immaterial particular at least makes this possible in a way it would not be if the human soul were like every other form.

I spell out Aquinas’s position in detail in chapter 4 of Aquinas. The point for now is that the reasons why the soul should be understood as something which operates independently of matter are not to be found in Plato’s final argument. But they are hinted at in Plato’s remaining argument for the soul’s immortality, namely the affinity argument.

As it happens, the affinity argument is the one some commentators seem to regard as the worst of Plato’s arguments for the soul’s immortality. One reason for this is that they often interpret it as an argument from analogy. That is to say, they think Plato is arguing along something like the following lines: If the soul is like the Forms in one respect – namely, being invisible to the senses – then it is probably like them in another respect as well, viz. in being imperishable. The trouble with the argument, then, is obvious: The analogy is simply too weak and undeveloped to support the conclusion.

It is understandable why a modern reader would read the argument this way. Plato does make use of an analogy, after all. And modern readers are used to thinking of metaphysical arguments as quasi-empirical hypotheses a la Paley’s “design argument” for God’s existence. But as every Thomist knows, not every philosophical use of analogy constitutes an “argument from analogy” in the modern sense, and metaphysical arguments (or good metaphysical arguments, anyway) are not quasi-scientific empirical ones. A failure to make these distinctions is what leads so many modern readers to misread Aquinas’s Fifth Way as a precursor of Paley. It is also what leads them to misread Plato as offering a lame argument from analogy for the immortality of the soul.

In fact, as Michael Pakaluk has pointed out, the affinity argument is not an “argument from analogy” at all, but rather “an argument about the nature of things.” Plato is not saying: “The soul is like the Forms in one way, so there is some significant probability that it is like them in this other way too.” Rather, he is saying something like: “The soul of its nature is X. But as we know from the example of the Forms, which are also X, things that are X are imperishable. So the soul is imperishable.”

What is X? As Lloyd Gerson suggests in his book Knowing Persons: A Study of Plato, what Plato seems to be emphasizing here is that the soul, like the Forms, is immaterial (p. 86). What the argument is (arguably) saying, then, is that whereas the senses pass away just as the things they know pass away, because both are material, the soul by contrast must be as imperishable as the things it knows – namely the Forms – because like the Forms, it is immaterial. In other words, it is, on this interpretation, the immaterial nature of the Forms that makes them imperishable, so that something that shares that nature – as (the argument claims) the soul does – must be equally imperishable. Notice, again, that this is not a probabilistic argument from analogy, but, in effect, an attempt at a proof. The argument is not:

1. The Forms are imperishable.

2. The soul is in some other respects analogous to the Forms.

3. So it is probably like them in being imperishable too.

That would indeed be a bad argument. Rather, the argument is (I am suggesting) to be understood along something like the following lines:

1. What is immaterial is imperishable.

2. The Forms are immaterial.

3. So the Forms are imperishable.

4. But since the soul knows the Forms, it must be as immaterial as they are.

5. So the soul must be imperishable.

Say what you will about this argument, it is not an argument from analogy, and it is not probabilistic. (Leave such weak tea arguments to the moderns. The ancient and medieval philosophers preferred the strong drink of metaphysical demonstration.)

OK, but what of the crucial premise 4? If it does not rest on an argument from analogy, what does it rest on? I would suggest that what Plato is gesturing at here is a line of argument that would later be developed more thoroughly and carefully by writers like Aristotle and Aquinas. The basic idea is that the intellect’s grasp of an abstraction like triangularity (for example) would simply not be possible unless it were as immaterial as triangularity itself is. There are three main considerations in favor of this judgment:

A. For a parcel of matter to take on a form is for it to become a thing of the kind the form is a form of; for example, for it to take on the form of triangularity is just for it to become a triangle. Now for the intellect to grasp the nature of a thing is just for it to take on the form of that thing. And in that case, if the intellect were material, it would become a thing of the kind that it grasps; for instance, it would become triangular when it grasps the form of triangularity. But this is obviously absurd. So the intellect is not material.

B. Forms and our thoughts about them are precise, exact, or determinate in a way no material thing can be even in principle; hence a thought cannot possibly be anything material.

C. Forms are universal while material representations are necessarily particular; hence to grasp a form cannot in principle be to have a material representation of any sort.

Obviously these arguments need spelling out, and I have said much more about them in several places. All of them are discussed in The Last Superstition (see especially pp. 123-126) and at greater length in Aquinas (see especially pp. 151-159), and both books set out in detail the metaphysical background apart from which the arguments cannot properly be understood. Arguments of the sort represented by B and C are discussed in more detail in the “Intentionality” chapter of my book Philosophy of Mind. Argument B in particular was the subject of an earlier post, and has in contemporary philosophy been developed most thoroughly by James Ross (see e.g. his article “Immaterial Aspects of Thought”). The point for now is that there is a family resemblance between what Plato was apparently up to in the affinity argument, and later arguments in the broad classical tradition that attempt to show, not by means of probabilistic arguments from analogy, but on the basis of an analysis of the nature of thought itself, that the soul (or its intellectual powers, in any event) cannot even in principle be material.

Apart from their misguided tendency to interpret classical metaphysical arguments as quasi-empirical hypotheses, another reason modern interpreters often badly misunderstand the affinity argument may be that, as Gerson notes, they tend to take for granted a post-Cartesian “representationalist” conception of knowledge (Knowing Persons, pp. 81-2). But the classical and medieval approach to knowledge was in general not representationalist. The great pre-modern writers did not regard the mind as a veil of “representations” which needed somehow to be correlated with external objects and events. Rather, for them knowledge involved a kind of union – not a correlation, but an identity of sorts – of the knower and what is known, insofar as when we know, one and the same essence or nature exists simultaneously in the intellect and in the world. (I have discussed this idea at greater length in an earlier post.) Naturally, then, if the object of knowledge is immaterial, that with which it is (in some sense) identical – the state of the knower – was regarded by them as immaterial too.

Here, though, as so often happens when modern readers encounter the arguments of ancient and medieval philosophers, the clearing up of one misunderstanding is likely only to lead to another. “How can the mind possibly be identical with what it knows?” the modern reader is bound to ask incredulously. “What absurdity!” Just as they often assume (with little or no argument, other than an appeal to the authority of Frege) that the concept of existence is entirely captured by the existential quantifier, so too might contemporary readers assume that the concept if identity is entirely captured by the identity relation as it is understood in modern logic. But this would be a mere prejudice. As Gyula Klima has emphasized in a series of important papers, the metaphysical doctrines of pre-modern philosophers typically presuppose semantic and logical doctrines that are very different from, but every bit as sophisticated and defensible as, those taken for granted by most contemporary philosophers. (What I have to say in the earlier post just linked to, and what I have said in recent posts about the Thomistic doctrine of analogy, may provide at least a hint of some of the differences. But this is a gigantic topic of its own.)

In general, while contemporary readers know that the difference between their view of the world and that of the ancient and medieval philosophers is radical, they generally do not know just how radical it is. Indeed, their ignorance of the differences is so great that they typically do not so much as even understand what the ancients and medievals were saying – hence (for example) they regard Aristotle as having put forward a “functionalist” “philosophy of mind,” Plato as having given an “argument from analogy,” and Aquinas as having foreshadowed Paley. In short, the moderns insist on reading the great figures of pre-modern philosophy as if they were all essentially just less well-informed versions of themselves – a double insult.

I suggested in an earlier post that Descartes’ “clear and distinct perception” argument for dualism represents a corrupted version of earlier and better Scholastic arguments. What is true in it isn’t new, and what’s new isn’t true. But if Descartes marks a decline, Plato’s affinity argument marks the beginning of an ascent. It is a mark of our own philosophical impoverishment that we can no longer recognize either the ascent or decline for what they were – much less the power of the Aristotelian-Scholastic arguments to which the ascent led and away from which the decline has taken us.

Of course, you might not agree with me about that. So at least agree with the more measured words of Gerson, with which I’ll conclude: “[The affinity] argument, like the others, is not supposed to stand on its own. And at its core there is an argument which, far from being inconsequential, is the origin of a family of immensely influential arguments for the immateriality of the person. These arguments are refined and elaborated upon by countless later Platonically inspired philosophers. They are still, in my view, worthy of interest.” (Knowing Persons, p. 79)

Vallicella on hylemorphic dualism

Hylemorphic dualism is the approach to the mind-body problem taken by Aquinas and the Thomist tradition more generally.  (The label may have been coined by David Oderberg, who defends the view in an important paper and in his book Real Essentialism.  “Hylemorphic” is sometimes spelled “hylomorphic,” though the former spelling is arguably preferable since it is closer to the Greek root hyle.)  The view holds both that the soul is the substantial form of the living human body (that is the “hylemorphic” part) and that it is unique among the forms of material things in being subsistent, that is, capable of surviving beyond the death of the body (that is the “dualism” part).  Our friend Bill Vallicella has recently put forward the following criticism of the view:

Was Aquinas a materialist?

Denys Turner’s recent book Thomas Aquinas: A Portrait is beautifully written and consistently thought-provoking.  It is also a little mischievous, in a good-natured way.  A main theme of the book is what Turner characterizes as Aquinas’s “materialism.”  Turner is aware that Aquinas was not a materialist in the modern sense.  And as I have emphasized many times (such as at the beginning of the chapter on Aquinas’s philosophical psychology in Aquinas), you cannot understand Aquinas’s position unless you understand how badly suited the standard jargon in contemporary philosophy of mind is to describe that position.  Turner’s reference to Aquinas’s “materialism” is intended to emphasize the respects in which Aquinas’s position is deeply at odds with what many think of as essential to a “dualist” conception of human nature.  And he is right to emphasize that.  All the same, as I have argued before, if we are going to use modern terminology to characterize Aquinas’s view -- and in particular, if we want to make it clear where Aquinas stood on the issue that contemporary dualists and materialists themselves think is most crucially at stake in the debate between dualism and materialism -- then “dualist” is a more apt label than “materialist.”

So, what are you doing after your funeral?

There is, among contemporary Thomists, a controversy over the metaphysical status of human beings after death.  Both sides agree that the human soul is the substantial form of the living human body, both sides agree that the human soul subsists after death, and both sides agree that the body is restored to the soul at the resurrection.  But what happens to the human being himself between death and resurrection?  Does a human being in some way continue to exist after death?  Or does he cease to exist until the resurrection?  Which answer do the premises that both sides agreed on support?  And which answer did Aquinas himself support?

The pre-existence of the soul

Our visit to hell hasn’t ended.  (How could it?)  More on the subject of damnation in a forthcoming follow-up post.  But first, a brief look at another topic which, it seems to me, is illuminated by the considerations raised in that previous post.  Can the soul exist prior to the existence of the body of which it is the soul?  Plato thought so.  Aquinas thought otherwise.  In Summa Contra Gentiles II.83-84 he presents a battery of arguments to the effect that the soul begins to exist only when the body does.

The last enemy

There are two sorts of people who might be tempted to think of death as a friend: those who think the nature of the human person has nothing to do with the body, and those who think it has everything to do with the body; in short, Platonists and materialists.  Protestant theologian Oscar Cullmann summarizes the Platonist’s position in his little book Immortality of the Soul or Resurrection of the Dead? as follows:

Vallicella on hylemorphic dualism, Part II

Bill Vallicella has kindly replied to my response to his recent post on hylemorphic dualism.  The reader will recall that Bill had suggested in his original post that, given the apparent tension between hylemorphism and dualism, Aquinas’s hylemorphic dualism seems ad hoc and motivated by Christian theological concerns rather than by philosophical considerations.  I argued that this charge cannot be sustained.  Whether or not one ultimately accepts hylemorphic dualism, if one agrees that there are serious arguments both for hylemorphism and for dualism, then -- especially when we add independent metaphysical considerations such as the Scholastic principle that the way a thing acts reflects the manner in which it exists -- one should at least acknowledge that hylemorphic dualism has a philosophical rationale independent of any Christian theological concerns.  It seems Bill still disagrees, but I do not see how his latest post gives any support to his original charge.

Cardinal virtues and counterfeit virtues

The cardinal virtues are wisdom, courage, moderation, and justice.  They are so called because they are traditionally regarded as the “hinge” (cardo) on which the rest of morality turns.  We find them discussed in Plato’s Republic and given a more given systematic exposition in Aquinas’s Summa Theologiae.  

For Plato, these virtues are related to the three main parts of the soul and the corresponding three main classes in his ideal city.  Wisdom is the characteristic virtue of the highest part of the soul -- the rational part -- and of the highest class within the city, the ruling philosopher-kings.  Courage is the characteristic virtue of the middle, spirited part of the soul, and of the soldiers who constitute the second main class in the city.  Moderation is the characteristic attribute of the lowest, desiring part of the soul and of the lowest, productive class of the city.  Justice in turn is the proper ordering of the three parts of the soul and the city, each doing its part.

Knowing an ape from Adam

On questions about biological evolution, both the Magisterium of the Catholic Church and Thomist philosophers and theologians have tended carefully to steer a middle course.  On the one hand, they have allowed that a fairly wide range of biological phenomena may in principle be susceptible of evolutionary explanation, consistent with Catholic doctrine and Thomistic metaphysics.  On the other hand, they have also insisted, on philosophical and theological grounds, that not every biological phenomenon can be given an evolutionary explanation, and they refuse to issue a “blank check” to a purely naturalistic construal of evolution.  Evolutionary explanations are invariably a mixture of empirical and philosophical considerations.  Properly to be understood, the empirical considerations have to be situated within a sound metaphysics and philosophy of nature.

Some questions on the soul, Part III

In some recent posts I’ve been answering readers’ questions about the Aristotelian-Thomistic (A-T) understanding of the soul.  One more for the road, from a reader who is unclear about why mind-body interaction, which is notoriously problematic for Cartesian dualism, is not also problematic for A-T.  The reader writes:

[U]nless something like dualist interactionism is true, I don't see how… immaterial thoughts and - in particular - the will - could possibly cause me to do something as simple as typing this e-mail…

Science would seem to say that the efficient cause of this was certain electrochemical reactions in my body.  The material cause would be the physical events happening in my body.  It seems that A-T philosophy would hold that the final cause was getting an answer to a philosophical question, and I agree.  My soul would then be the formal cause, but I guess that notion is incoherent to me… And, unless the immaterial mind somehow interacts with my body (through quantum physics, maybe?), I don't see how my thinking about something in my immaterial intellect could cause my body to do anything.

Mind-body interaction: What’s the problem?

Aristotelian-Thomistic (A-T) philosophers often argue that an advantage of their view of human nature over that of the Cartesian dualist is that they don’t face an interaction problem.  Soul and body are on the A-T view related as formal and material cause of the human being.  Hence they don’t “interact” because they aren’t two substances in the first place, but rather two principles of the same one substance, viz. the human being.  Talk of them “interacting” is a kind of category mistake, like talk about the form of a triangle and the matter that makes up the triangle “interacting.”  So there is no problem of explaining how they interact.

What is a soul?

To be more precise, what is a human soul?  Or to be even more precise, what is a human being?  For that is really the key question; and I sometimes think that the biggest obstacle to understanding what the soul is is the word “soul.”  People too readily read into it various erroneous notions (erroneous from an Aristotelian-Thomistic point of view, anyway) -- ghosts, ectoplasm, or Cartesian immaterial substances.  Even the Aristotelian characterization of the soul as the form of the living body can too easily mislead.  When those unfamiliar with Aristotelian metaphysics hear “form,” they are probably tempted to think in terms of shape or a configuration of parts, which is totally wrong.  Or perhaps they think of it in Platonic terms, as an abstract universal that the individual human being participates in -- also totally wrong.  Or they suspect that since it is the form of the living body it cannot coherently be said to subsist apart from that body -- totally wrong again.   So let us, for the moment, put out of our minds all of these ideas and start instead with the question I raised above.  What is a human being?

How to animate a corpse

One of the downsides of being a philosopher is that it makes it harder to suspend disbelief when watching horror flicks.  Plot holes become more glaring and speculations seem wilder when one’s business is looking for fallacies.  On the other hand, there is nothing so absurd but some philosopher has said it; hence there’s no one better placed to find a way to make even the most preposterous yarn seem at least remotely plausible.  A case in point, submitted for your approval: My take on a segment from Rod Serling’s Night Gallery, adapted from H. P. Lovecraft’s short story “Cool Air.”  (You can find it on Hulu and YouTube.)  Watching it for the first time recently, I was annoyed by what at first seemed to me an obviously nonsensical twist ending.  On further reflection, there is a way to make sense of it, if one makes the appropriate metaphysical assumptions.

How to go to hell

How is it that anyone ever goes to hell?  How could a loving and merciful God send anyone there?  How could any sin be grave enough to merit eternal damnation?  How could it be that not merely a handful of people, but a great many people, end up in hell, as most Christian theologians have held historically?

The interaction problem

Aristotle and the Scholastic tradition influenced by him famously held that to understand a thing required knowing each of its four causes: its material cause, the stuff out of which it is made; its formal cause, the specific form or essence that stuff has taken on, and which makes it the kind of thing it is; its efficient cause, that which brought it into existence; and its final cause, the end or purpose toward which it is directed. Modern thought is largely defined by its rejection of two of Aristotle's four causes. For the moderns, there are no such things as substantial forms or fixed essences, and there are no ends or purposes in nature. There are just brute material elements related by purposeless, meaningless, mechanical chains of cause and effect.

As I have emphasized in my series of posts on dualism, this “mechanical” conception of nature, insofar as it stripped matter of anything smacking of either goal-directedness or sensible qualities as common sense understands them, and relocated these features into the mind, more or less automatically entailed a Cartesian form of dualism on which intentionality and qualia are immaterial as a matter of conceptual necessity. But it also automatically entailed that this form of dualism would suffer from the notorious “interaction problem.”

For the moderns, all causation gets reduced to what the Aristotelians called efficient causation; that is to say, for A to have a causal influence on B is for A either to bring B into being or at least in some way to bring into existence some modification of B. Final causality is ruled out; hence there is no place in modern thought for the idea that B might play an explanatory role relative to A insofar as generating B is the end or goal toward which A is directed. Formal causality is also ruled out; there is no question for the moderns of a material object’s being (partially) explained by reference to the substantial form it instantiates. We are supposed instead to make reference only to patterns of efficient causal relations holding between basic material elements (atoms, or corpuscles, or quarks, or whatever).

Thus, if the mind considered as immaterial is to have any explanatory role with respect to bodily behavior, this can only be by way of some pattern of efficient causal relations – to put it crudely, in terms of a Cartesian immaterial substance (or perhaps various immaterial properties) “banging” into the material substance (or material properties) of the brain like the proverbial billiard ball. How exactly this is supposed to work is notoriously difficult to explain. We’ve got two independently existing objects (or two independently existing sets of properties) somehow interacting the way physical particles or billiard balls do, or perhaps the way waves or fields of force do – except that one of these objects (or sets of properties) is utterly devoid of any of the material features that make it possible for something to count as a particle, billiard ball, wave, or field of force. Add to this considerations like the conservation of energy and interaction between the material and immaterial realms comes to seem ruled out in principle by our current understanding of the way the material world works.

But from an Aristotelian-Scholastic point of view, this whole picture of the mind-body relationship is hopelessly wrongheaded from start to finish. It is wrong to think of the soul (of which the intellect is for Aristotelians but a part, not the whole) and the body as independent objects in the first place. The soul is rather a form that informs the matter of the body and the body is the matter which is informed. As with the form and matter of a stone, tree, or earthworm, what we have here are not two substances interacting via efficient causation, but rather two metaphysical components of one substance related by formal causation. As the form of the stone is to the matter making up the stone, the form of the tree to the matter making up the tree, and the form of the earthworm to the matter that makes up the earthworm, so too is the human soul to the human body. There is in principle no such thing as the matter of a stone, tree, or earthworm apart from the form of a stone, tree, or earthworm respectively, and no such thing as the form of any of these things existing apart from their matter. The form and matter don’t “interact” as if they were two distinct objects; rather, the form constitutes the matter as the (one) kind of object it is in the first place.

Similarly, there is in principle no such thing as the matter of a living human body without a human soul and there is in principle no such thing as a human soul which is not the soul of some body. (This does not entail that the soul cannot survive the death of the body, only that it could not have existed in the first place unless it was united to some body; but this is a topic that can be bracketed off for present purposes.) The soul doesn’t “interact” with the body considered as an independently existing object, but rather constitutes the matter of the human body as a human body in the first place, as its formal (as opposed to efficient) cause.

As I move my fingers across the keyboard, then, what is occurring is not the transfer of energy (or whatever) from some Cartesian immaterial substance to a material one (my brain), which sets up a series of neural events that are from that point on “on their own” as it were, with no further action required of the soul. There is just one substance, namely me, though a substance the understanding of which requires taking note of each of its formal-, material-, final- and efficient-causal aspects. To be sure, my action counts as writing a blog post rather than (say) undergoing a muscular spasm in part because of the specific pattern of neural events, muscular contractions, and so forth underlying it. But only in part. Yet that does not mean that there is an entirely separate set of events occurring in a separate substance that somehow influences, from outside as it were, the goings on in the body. Rather, the neuromuscular processes are by themselves only the material-cum-efficient causal aspect of a single event of which my thoughts and intentions are the formal-cum-final causal aspect. There is simply no way fully and accurately to describe the one event in question without making reference to each of these aspects. Just as there is no such thing as the matter of a stone or tree apart from the form of a stone or tree, there is no such thing as the “physical” side of my action apart from the “mental” side. To make reference to the “physical” side alone would simply be to leave out half of the story, and indeed the most important half, just as describing the word “cat” in a way that makes reference to the shapes of the letters, the chemicals in the ink in which it is written, and so forth, while never saying anything about the meaning of the word, would leave out the most crucial part of that story.

As psychologist Jerome Kagan emphasizes in his recent book An Argument for Mind (my review of which can be found here) the trouble with trying to pick out some particular pattern of neural or other physiological events and identify some mental event with it (or in any other way attempt entirely to explain the mental in terms of the physiological) is that the same physiological pattern can underlie different mental events and the same mental event can be associated with different physiological patterns. This is a problem well-known to students of the history of the mind-brain identity theory (cf. Davidson’s anomalous monism), though it seems to me that many philosophers do not appreciate just how deep the problem goes, and how thoroughly devastating it is to materialism. As writers like James F. Ross have argued, at least some of our mental states are determinate in a way that no material process or set of processes can be even in principle, so that the hope of making mental states out to be identical with or supervenient upon physical states is an illusion. Without formal and final causes, it is inevitable that the project of assigning some specific, determinate mental content to this or that material substrate will come to grief. (Thus does the interaction problem arise in a new form even for materialists themselves, under the guise of the “mental causation problem.”)

Hence there can, on an Aristotelian-Scholastic view, be no question of some uniquely identifiable set of physiological events with which an independently identifiable set of mental events needs somehow to be correlated in efficient causal terms. There is just the one event of writing the blog post, of which the formal, material, efficient, and final causal components are irreducible aspects. The question of "interaction," in the relevant sense, simply cannot even get off the ground. As is so often the case with objections raised against modern defenses of traditional philosophical views (such as theism and natural law ethics), the interaction problem facing Cartesian forms of dualism arises precisely because these forms of dualism are modern, precisely because they take on board certain modern (especially mechanistic and/or nominalistic) assumptions which they (like theists and natural law theorists) ought instead to repudiate.

I have said much more about all of this in Philosophy of Mind and (especially) The Last Superstition, and I will say more about some of these issues in further posts to come in my series on brief arguments for dualism. The point for now is just to highlight that what we have here is yet another respect (among a great many others that I describe in detail in TLS) in which the early modern philosophers’ transition away from Aristotelianism to a mechanical understanding of nature constituted not an advance but a regression, a willful forgetting of crucial distinctions and categories the drawing and elucidation of which had been one of the great achievements of Scholasticism, and a conceptual impoverishment that inevitably created problems rather than solved them. The interaction problem was by no means the least, or last, of these problems.

Some questions on the soul, Part II

In a recent post I responded to a reader’s question about the Aristotelian-Thomistic understanding of the soul.  Another reader asks another question.  Let me set out some background before addressing it.  From the Aristotelian-Thomistic point of view, strictly intellectual activity -- as opposed, say, to sensation or imagination -- is not corporeal.  This is the key to the soul’s immortality.  A human being is the sort of thing that carries out both non-corporeal and corporeal activities.  Though less than an angel, he is more than an ape, having a metaphysical foot, as it were, in both the immaterial and material camps.  That means that when his corporeal operations go, as they do upon death, it doesn’t follow that he goes.  He limps along, as it were, reduced to the non-corporeal side of his nature.  This reduction is drastic, for a great deal of what we do -- not only walking, talking, breathing, and eating, but seeing, hearing, smelling, and so forth -- depends on the body.

The comedy keeps coming

Stop me if you’ve heard this one before, but while we’re on the subject of humor, here’s another mistake that is often made in discussions of it: failing to identify precisely which aspect of the phenomenon of humor a theory is (or is best interpreted as) trying to explain.  For instance, this is sometimes manifest in lists of the various “theories of humor” put forward by philosophers over the centuries.

Averroism and cloud computing

The Latin followers of the medieval Islamic philosopher Ibn Rushd or Averroes (1126 - 1198), such as Siger of Brabant, famously taught the doctrine of the unity of the human intellect.  The basic idea is this: The intellect, Averroists (like other Aristotelians) argue, is immaterial.  But in that case, they conclude (as not all Aristotelians would), it cannot be regarded as the form of a material body.  It is instead a substance entirely separated from matter.  But matter, the Aristotelian holds, is the principle by which one instance of the form of some species is distinguished from another.  Hence there is no way in which one human intellect could be distinguished from another, so that there must be only a single intellect shared by all human beings.