Nguyen’s main
criticism of the book is that “if Feser intends to borrow the whole parts from
the thought of Aristotle and Aquinas on the soul, this treatise could benefit
greatly from a closer reading of the original texts.” Here it seems Br. Francis may have overlooked
some remarks I make in the Preface to the book:
[T]hough Aristotle and St. Thomas are by far the greatest
influences on my own views, this book is not concerned with exegesis of their
work. The claims and arguments I defend
in this book are mine, and not always necessarily theirs. If, on some topics, I say something that
sounds very much like what they say, that is because I think they were right
about it. If, on other topics, I say
something that is different from anything they say, or even conflicts with what
they say, that is because I think my approach is better. Like other Thomists, I am often accused of
following Aquinas too closely, but also of not following him closely
enough. In reality, I try only ever to
follow an argument wherever it leads. (p. 5)
Among academics
and autodidacts who are classified as Thomists, there are two general
types. The first are those whose
emphasis is on developing the most plausible formulation possible of Thomistic
ideas and arguments and applying them to contemporary issues and
controversies. The second are those
whose emphasis is on the closest possible reading of St. Thomas’s own texts and
those of the great commentators on St. Thomas.
(There is a similar distinction to be made among those classified as
Aristotelians.)
Both tasks
are important, and both groups can and should learn from each other. There need be no rivalry between them. But each has its potential drawbacks. From the point of view of the second group, those
in the first group do not always stick closely enough to what St. Thomas
himself actually said, or, where they go beyond him, stay within the range of
opinions developed by the great Thomists of the past. From the point of view of the first group,
those in the second group are too prone to obsessive nitpicking over exegetical
minutiae, to policing alleged departures from what they claim to be authentic
Thomism, and to an insularity that leads them to talk more to other Thomism
adepts than to the wider world.
I’ve always
been in the first group, and while I certainly agree that it has potential drawbacks
that need to be guarded against (as all approaches do), in my opinion the most
urgent task today is to get Aristotelian and Thomistic ideas and arguments into
the contemporary conversation, rather than to pursue what can often seem endless
“in-group” debates over Aristotle or Aquinas exegesis. Hence, while commentary from the second group
on the work of the first group is sometimes helpful, in my experience a lot of
it has the feel of petty sniping from the sidelines. That’s the reason for the remarks I put in
the Preface.
Br. Francis
is fair-minded, and not guilty of this sort of sniping. However, it does seem to me that some of his
remarks are a little pedantic. He
objects to my using “synthetic sense” in place of the “common sense,” and to my
characterizing “passive intellect” and “possible intellect” as sometimes used
synonymously (he cites a passage from Aquinas that distinguishes the possible intellect
from the passive intellect).
The unwary
reader might think from Br. Francis’s remarks that I am guilty of making elementary
mistakes in reading Aristotle and Aquinas.
But in fact, as anyone can see who reads the pages he cites from my
book, I make clear there that I was merely noting how some early
twentieth-century Thomists had themselves come to use the terms in
question. (For example, Thomas Verner
Moore’s Cognitive
Psychology proposes “synthetic sense” as a term to include the functions
of what had traditionally been called the “common sense”; and H. D. Gardeil’s Psychology
uses “possible intellect” and “passive intellect” as interchangeable.) As I explain, I adopted these usages of “synthetic
sense” and “passive intellect” because it seemed to me that they were least
likely to be misunderstood by modern readers unfamiliar with Aristotelian and
Thomistic jargon. As long and bitter
experience has taught me, though, every gain in intelligibility for contemporary
readers has the cost of criticism from sticklers for more traditional usage!
In fairness to Nguyen, though, he characterizes these as “relatively minor flaws of this work” which “do not appear to obstruct its great merit.” I thank him for his engagement with and kind words about the book.


For what it's worth, I think it's great that we have Thomists involved in all kinds of endeavors , I have found ways in which to follow all of them, In the space of Philosophy of Mind and Nature, I think Prof is almost second to none, When it comes to theology Fr White and Dr Matthew Levering are right up there, When it comes to Thomistic Metaphysics especially on matters of causality and in general in matters regarding Aquinas, I think Fr Stephen Brock is second to none, In matters of practical ethics and morality, Dr Budziszewski and Dr Steven Jensen are absolutely brilliant. So it's great that we have Thomists engaged in all kinds of endeavors.
ReplyDeleteDear Dr Feser, thank you very much for the helpful characterisation of the two general types of Thomists today. Please can I ask would your book Aquinas a beginners guide still fall into the first group, or would that be more in the second group, and then your Five Proofs book would fall into the first group? I'm sorry if that's off topic, please delete this if it's not appropriate., I'm a lay Catholic but not a philosopher or theologian so just trying to learn. Thank you so much for all you do, your work has helped strength my faith so much especially in difficult times, thank you.
ReplyDeleteFeser's book on Aquinas goes into the Five Proofs
DeleteThank you very much.
DeleteDr. Feser, could you please write an article on the Aristotelian interpretation of molecular automata, the molecular machines that execute DNA instructions and form the basis of biological computation (or biological cybernetics)?
ReplyDeleteAs the good Prof. Feser says, there's good value in both camps. For example, if one is overly eager to apply "Thomas-like" reasoning to modern arguments, and insufficiently attentive to what Thomas actually said it is possible to run into errors that Thomas would have avoided (and maybe did avoid) and still think you're being fully "Thomistic".
ReplyDeleteBut there's also a fully viable solution to the tension between the two emphases: to mention and clarify the details. A person more involved in applying A-T philosophy to the modern arena of argument might, for example, footnote that "in this area, there is actually some dispute about the details of what Aquinas actually thought, with one passage seeming to lean in favor of X, and another passage seeming to lean in favor of Y. There are modern commentators on each side of that argument, such as N and M. I don't intend to solve or even address that intra-Thomistic dispute, because on this matter I think neither X nor Y is sufficient on its own, and I am proposing instead Z as the proper approach."
In other cases, the same philosopher engaged in applying A-T to modern arguments might say, in clarification: "heretofore there had been a rather in-house dispute as to whether Aquinas meant X or Y. While I haven't studied every single aspect of the arguments of what he most probably meant, I argue here that X is actually the true solution and Y is incorrect. So if there is (relatively) equal merit on each side as to whether Aquinas meant X or Y, we can in charity attribute X to Aquinas as it is more correct, though recognizing this attribution is subject to revision if stronger arguments come along showing Aquinas really meant Y."
Or, alternatively "I recognize that many Thomists attributed X reading of the matter to Aquinas, and I see that their arguments are quite reasonable. However, I actually believe Y is the better answer, and to the extent that X is more faithful to what Aquinas actually said, I explicitly disagree with Aquinas here.
Or "there is a dispute in current circles on this, and while I haven't completely satisfied myself on an independent basis my own take on how to resolve the various arguments, it seems that Aquinas's position was X, and I am satisfied that this position is reasonable enough on that basis even if perchance it is not proven demonstrably.
That is, if one simply documents the details, there is nothing inappropriate in NOTING matters of textual analysis and dispute while setting those aside in claiming a substantive position on its own merits, or on the merits of Aquinas's authority as Doctor, or on whatever grounds you select. Neither camp should be getting into a tizzy by someone who so documents their stance in relation to Aquinas's own texts, his commentators, and the moderns. And even, where appropriate, noting where descending even further into an internecine rabbit hole of "what Thomas meant" dispute fails on a cost/benefit basis. And clearly Feser has done this kind of positioning explanation.
I think the professor has an advantage that most of us lack. The advantage being that he is actually teaching students who most likely have little background in the subject. So by now he's figured out what gets through and what doesn't. Most of the proponents of the views he compares to the Thomist account in the book are probably in the same camp. Since he wrote it for this wider audience it makes sense to stay out of the Thomistic weeds.
DeleteThat was well said. The prof teaches at a junior college that doesn't offer a philosophy major, so he aims at a wider audience and doesn't get into the weeds.
DeleteI don’t know if this is an appropriate place to do this because I’m not commenting on your review of the review of the book, but instead just commenting on the book, but one argument I thought I didn’t understand (or perhaps is wrong) is the use of Zeno type paradoxes to justify why you cannot infinitely subdivide a substance into constituent particles of smaller and smaller size that actually exist in it. The intuition seems to be that an infinite sum of finite sizes will be infinite, and therefore everything would have to be infinite size unless you grant that more fundamental particles exist only potentially. But an infinite sum of finite sizes need not itself be infinite. Consider 1+1/2 +1/4+1/8 …. ad infinitum. The sum of that series asymptoticly approaches 2, not infinity.
ReplyDeleteAnonymous July 9, 2026 at 5:44 AM,
DeleteYou are mixing up numbers and physical objects as if they were the same thing. Numbers do not occupy space but physical objects do. Since physical objects actually do take up space if you continue to put them end to end one after the other eventually the line of objects will measure 1 inch, then 2 inches etc. no matter how finitely small they are.
Erm, I guess I disagree, because you can just numerically describe the size of a thing, so a particle of size 1” + a particle of size 1/2 “ + a particle of size 1/4 “ …. ad infinitum will just approach 2”, not infinite inches.
DeleteAnonymous July 10, 2026 at 3:58 AM,
DeleteSorry. I didn't pay close attention to the series aspect you presented. It kind of the reverse of the Zeno paradox of things being subdivided as you stated here:
why you cannot infinitely subdivide a substance into constituent particles of smaller and smaller size that actually exist in it.
Aristotle answered this by pointing out that doing this by definition could never be completed physically because it would have to be done an infinite number of times. I suppose the same argument could be made regarding things being added together infinitely.
Aristotle also thought that there was a limit to how many divisions were possible before a thing could no longer exist as that thing, like water molecules being divided until a single molecule stopped being water and was split into oxygen and hydrogen. Today, we have the Planck limit that stop infinite divisions.
You can test this at home by cutting a length of string of 1/2 ft, then, repeatedly, cut a length of string 1/2 the length of the previous one and place it end to end with the one already cut. So first 1/4 ft, then 1/8th ft then 1/16 ft etc. You will notice that the combined length of all your pieces of string is always the length you most recently laid down away from 1ft. As the number of pieces of string, N, tends to infinity, the gap between the end of the aggregate of string pieces and 1 ft is will tend to 1/(2^N) ft = 0 ft so the combined length will tend to to 1 ft. Infinite pieces of string, but only 1 ft spanned.
DeleteAnonymous July 10, 2026 at 12:02 PM,
DeleteI assume you posted your latest before my latest comment became visible.
Leaving aside the physical problems with carrying out cutting pieces of string into smaller and smaller pieces and adding them one after the other, if you try this at home you will never finish. That is why this cannot actually be done.
Yes, your assumption is right, sorry. I think your (and Aristotle's) reason about infinite subdivision being physically unrealisable is a plausible defense of why infinite subdivision isn't possible, at least the way it looks in our physics.
DeleteI suppose in the context of my original criticism of that part of the book, that doesn't seem to be the point made though. Feser's argument doesn't seem to be you can't have further and further subdivision of a substance into smaller and smaller sub particles because this would have to go on forever and this is physically impossible to happen/construct/arrange/whatever because of the regress. Instead, the argument seems to be that if there were such subdivision the sum of the sizes would have to be infinite (a la Zeno). I still think that sounds fishy, and maybe the other four arguments arguing to the same conclusion, which, to me, seem stronger, would be more convincing if not mixed with that one.
I suppose, speaking personally, part of the appeal of Ed's work is that it presents clear satiating arguments that hopefully help me, my family and hopefully fair minded people in the public square, rather that a lot of apologetic work which often seems to be moralistic bromides. If the one of the aims of the book is to have Thomistic/Aristotelian ideas taken more seriously in the mainstream, one of the frustrations that I imagine a normie-liberal-scientist-materialist subject would be is that whilst recognising that philosophical or mathematical reasoning is a valid, and in a certain way, more sure, route to truth than empirical enquiry, a lot of the arguments are going to feel a lot like word play. This isn't what I think is going on obviously, I just think that given the reality of Bob's life (who is living out of wedlock with Ana and is embroiled in all kinds of vice etc) and with no prior formal philosophical engagement, not being able to 'test' the conclusions, however convincingly and tightly argued is going to be an obstacle. Especially when a lot of the history of western Philosophy does seem to be a bit of a tennis match of bonkers ideas (no-change, then everything is change.....).
Sorry, clicked publish before finishing the last comment, the point I was going to make, is that if these arguments are to be taken seriously, it is very important that they seem absolutely watertight. The Zeno one didn't seem like that to me, and seemed like a nasty counter example where the reasoning while intuitive has lead to a mistaken conclusion which might cast doubt on the others for the tentatively interested (but sceptical) reader.
DeleteAnonymous July 13, 2026 at 12:33 AM,
DeleteI agree with your concerns. If there are any weak spots in any arguments the sceptic will certainly focus on that and ignore the rest.
I wonder if could provide the chapter in Immortal Sousl where this argument is quoted. I found this from an old blog post that states this argument, but Feser attributes it to Zeno. Not something he endorses:
https://edwardfeser.blogspot.com/2010/09/philosophers-kids-say-darndest-things.html
Could the passage in the book be saying something similar?
It’s in the chapter Matter on p 172, he seems to pick up the argument from a book he cites “The Architecture of Matter” T Holden
DeleteI wonder if we have different editions. Zeno's paradox of parts is presented on page 176 of my edition. On page 177 he explains how Aristotle blocked the paradox by noting that an object is actually a single object until it is divided. It could potentially be divided and those divided parts could potentially be divided and so on an infinite number of times but those parts don't actually exist until the division has taken place.
DeleteOf course that potential infinite division could not actually take place for the reasons stated. But it seems that wasn't the point Feser was trying to get across.
Sorry, In my edition the chapter starts on 172, on 177 he seems to introduce the idea that Aristotle would say that he would grant to Zeno that there is an infinite number of smaller distances between A and B but only potentially rather than actually. “Hence there is not an actual infinite number of distances for a runner to traverse and the dichotomy paradox falls apart”. On page 196 he returns to the idea citing Holden. In this case the claim is that if “if extended parts are divisible into smaller extended parts as infinitum, and if all the extended parts are actually rather than merely virtually in physical objects, then it follows that every such object has an infinite number of parts” “the paradoxes identified by Zeno will follow, every physical object would be infinitely large”
DeleteI think the point seems to be: 1) You couldn’t have infinite actually existing parts in an object because it would result it being infinite in size as Zeno says. 2) Therefore they can only be in the object potentially and we should reject the mechanical philosophy which posits that the object is just a collection of actually existing particles to avoid this paradox.
Delete1) just seems wrong as illustrated by my string example so I don’t think 2) is supported by the idea at all.
Dear Dr. Feser, have you seen the news about the construsction of the first artificiall cell entirely from the non-living components by the team in the Universety of Minnesota? Do you think that it will lead to the extension of the debate about Aristotelean forms and our ability to discover new ones (like with your example of Styrofoam) and now, possibly, even our capacity to shape matter into life? Honestly, it seems way more important and interesting than current debates on AI.
ReplyDeleteGlad you brought that up.
DeleteI read that they had to use ribozomes taken from bacteria to get their cell-constructs going.
They are up against a "Chicken and the Egg" problem with ribozomes. Cells use ribozomes to make all the proteins that then combine into the various complexes that work like machines in the cell. Among those machines are; more ribozomes.
Until they can assemble a ribozome from raw chemicals, they cannot succeed in making a cell without using parts from an existing cell.
The Law of Biogenesis holds.
Thank you for the explanation. I knew that there was some limitation to this discovery because even the scientists themselves had to admit that this is not a proper artificial lifeform. So it is still more about exploring and developing the natural potential of those bacterial ribozomes than creating something from scratch.
DeleteWho knows what may lie ahead...."Brave New World."
DeleteI think this sort of thing is one of the most important issues facing society at this time. Is there a significance to how things are in nature or are they just arbitrary combinations? Arbitrary combinations that human beings can change however they want.
DeleteAn article from the university makes it clear what one of the researchers thinks (https://twin-cities.umn.edu/news-events/worlds-first-synthetic-cell-complete-life-cycle-could-revolutionize-biological):
"It proves that the most fundamental functions of life, like growth and replication, do not need a mysterious magical spark." I'm not exactly sure what it means and I'm not sure the researcher really knows precisely what she means by it either. Because even if was possible to make a cell from scratch (which as Tim the White pointed out they did not actually do), then why a cell, why that particular form and not whatever they want?
It's like with so-called AI where they will say, "this proves the human mind is not special, everybody should be replaced, except me, I should make billions of dollars because I'm a special genius". Well, if the human mind itself is of no significance, then why is some sociopathic bloviator of an executive special? The only thing that would make him special is his mind, but he just said it is of no significance. That's the other stupid thing, people like this say all life is meaningless, but then they seem to care a huge amount about money, which really is just a social convention.
I have to admit that I despise this ideology, supposedly it's about science or advancement or whatever, but actually it's just people wrecking nature or human society because they think it will benefit them.
But even then, the ideology is false. If it really was possible for human beings to manipulate whatever there is for whatever reason, things would look entirely different than they do. All these projections about the future that they make never come true. Human beings can work with what is in nature, but so far as it seems they cannot just make whatever they want for whatever reason.
I've read up on "SpudCell" and I think it's been grossly oversold. It doesn't actually reproduce itself and it doesn't actually feed. These things were subtly redefined in order to attribute them to it. It also doesn't expel waste and indeed doesn't have a real cell wall that would even allow it to do so while taking in nutrients.
DeleteThought I'd elaborate.
DeleteWe've long known that we can create spherical vessicles (balloons or sacks) of lipids, and that if you keep adding lipids to it, you will eventually cause it to split into two vessicles. You can make a droplet of water on a flat surface "reproduce" in the exact same way, via the same physical principles. Just keep adding water to it until the forces holding it together are overcome and it splits in two.
But this has absolutely nothing to do with how cells reproduce, which is a controlled and orchestrated process. In real life the cell wall doesn't just passively split under pressure. Rather, the cell makes two copies of everything needed to function, one copy migrates to either side in just the right place, and then it splits itself when it is ready.
The two different processes may look superficially similar under a microscope to someone who doesn't know better - a roughly spherical mass splitting into two roughly spherical masses, but logically and physically what is going on is completely unrelated.
But the passive splitting method is how SpudCell "reproduces." The researchers just keep injecting it with their specially formulated "nutrients," which fuels the ribosome reactions with the synthetic DNA strands, filling it up with tiny proteins and making it expand until the lipid vessicle is forced to burst apart into two or more smaller ones. This is of course a passive and disorderly occurrence, and only about 30% of the SpudCell "children" end up with a full copy of the "genome" when the vessicle is broken apart.
Second, it's not new news that we can take certain molecular components from a cell such as ribosomes, and have them carry out certain tasks outside of a cell, such as duplicating DNA strands we give them. And so it's not surprising that they can do the same when we inject them inside of a lipid vessicle.
DeleteThe thing is in these experiments is that humans always have to continually intervene to keep it going. We always have to provide the energy to fuel these reactions and remove interfering waste products. We always have to provide new cellular components to conduct the task, whereas biological reproduction entails a living organism carrying out these operations necessary to perpetuate reproduction on its own initiative and reproducing all of the components necessary to perform these tasks and to carry out reproduction itself (including ribosomes).
But all these problems still pertain to "SpudCell" and sticking the components inside a lipid sack doesn't change that. A lipid sack blocks molecules in both directions indiscriminately. It blocks energy sources from coming in and it blocks waste products from going out. A real cell wall contains various specialized molecular structures that create ion differentials allowing certain molecules to come in and certain molecules to go out as necessary. But for that reason a real cell wall needs to be maintained at all times by the cell and cannot be reproduced by just filling it up until it breaks apart, which goes back to my previous point.
Also, SpudCell needs ribosomes to "reproduce" but is not capable of generating ribosomes itself, which means that no actual reproduction is going on. Its short "genome" only codes a single small protein, whereas generating new ribosomes would require dozens of specialized proteins and RNAs with control structures to make sure they were assembled in just the right order. This would require a far bigger genome for starters, which would pretty much ensure no "child cell" ever got everything needed to reproduce when a lipid sack broke in two, and would make the necessity of a real cell wall for real consumption, waste disposal, and real ordered reproduction all the more necessary.
By the time you got through adding everything necessary, you'd be back at the complexity of actual living cells. But not only do we not know how to make actual living cells synthetically, we don't know how to make them out of formerly living cells. We can take necessary proteins out of a simple cell, thereby killing it, then inject them back in, and we have no idea how to make it alive again even though all the components are still there in the right place.
DeleteWhen you get past the hype, all that's happened here is some researchers yanked some ribosomes out of real cells and used them to carry out chemical reactions on a synthetic DNA strand we already knew they would do until the reactions petered out and the ribosomes fell apart. They put them inside lipid sacks so that the protein products of these reactions would fill the sacks to the point of breaking apart into smaller sacks a few times before the reaction was done. Because we know that real reproduction involves ribosomes and DNA strands, and because a lipid sack breaking in half looks superficially like cell division (one tiny round thing make two tiny round things), they called this "reproduction." In reality nothing was reproduced and these little lipid sacks with ribosomes and synthetic DNA strands stuck inside do not comprise functional wholes or reproductive units except by virtue of the researchers thinking of them as such.
The Deuce, that makes sense. These kinds of things are often exaggerated, but it is worthwhile to hear exactly what happened and what did not.
DeleteUnfortunately, science has become what fire was for the caveman. The mystical and almost theological aspect of 'science' (that is just a fancy materialism cloaked as what should be a method at best) can be shown to be false in the case of cells by a very old yet basic principle of life: immanent causation.
DeleteIf people weren’t so obstinate and fanatically devoted to the idol of 'science,' they would know how much bullshit the whole confabulation of 'life from scratch' really is. In other words, if they took immanent causation seriously — or at least understood its reality — this discussion wouldn’t even be happening in the first place.
Can anyone comment on the following proposed definition of life?
Delete"Functional polymers (nucleic acids and proteins) directed by encoded instructions to assemble functional polymers."
Vini:
DeleteYep. But bear in mind that that moderns don't believe in immanent causation / intrinsic purpose, don't even understand it, and so don't take it seriously.
It's taken for granted that what appears to be immanent causation by irreducible whole substances is an illusion that reduces to aggregate blind mechanistic causes and that irreducible whole substances themselves don't exist.
Furthermore, this view of biological organisms and their behavior is *required* by the mechanistic world picture and by the Darwinian narrative of life specifically.
As such, moderns need remedial lessons before they can even understand the concept, and they need to have a lot of bad metaphysical plaque cleared out of their philosophical arteries before they can even begin.
I don't think it is all that difficult to articulate what immanent causation is, why it must exist in living organisms, and why it is incoherent to deny it. But even Thomistic philosophers rarely do so clearly, I suspect because doing so inevitably means butting up against "settled science."
Hey, Deuce!
DeleteYeah, I think you're right. Unfortunately, Immanent Causation (and many other superb metaphysical tools for that matter) is unjustly denied or even excluded from the conversation.
I would tentatively argue that in the case of Immanent Causation (IC for short), its reality cannot be coherently denied by any normal, unindoctrinated person.
It would take a lot of time to explain why I think that's the case, but I think it boils down to this: no one can deny that a living thing acts for its own good. This fact alone is so obviously true that no sane human being (pace some odd figures) could ever deny it. In fact, it's so true that the skeptic wouldn't even deny the appearance of immanence but would instead try to "explain it away" as an illusion. The problem is that there is no way to convince someone who hasn't been indoctrinated by any of these ideological metaphysical systems that when a dog eats, say, it is a mere "play," "a mere façade," or anything like it.
In short, if any dispassionate person were to think it through and take IC seriously, they could see it more clearly than many other, more complex metaphysical claims because it's a reality so close and "right under our noses," so to speak, than some others.
"New Blackfriars" is published by Cambridge University Press. It is a very prestigious academic journal. Some articles can be read free online.
ReplyDeletehttps://www.cambridge.org/core/journals/new-blackfriars/open-access