I probed GPT-5.2 about the evolution of Hume's thinking about human reason and rationality from
in order to relate it to some ideas I gathered from David Wiggins. We then related this to themes from Aristotle about phronesis (practical wisdom) and arete (virtue). I was used to think of LLM-based AI-assistants as manifesting phronesis to a significant degree while lacking virtue, whereas in the case of human beings phronesis and virtue necessarily go hand in hand.
In this conversation, I came to reconsider and adjust this position somewhat. This led to some questions and suggestions about the proper way to go about with the development and use of AI systems that are very smart but constitutively lack conative autonomy (i.e. the ability to set their own goals and values in a way that is responsive to what's at stake
RevealUSER:
Hi GPT 5.2,
What is your understanding the of evolution of Hume's thinking about the nature of reason (or rationality) between A Treatise and An Enquiry?
GPT-5.2:
Hume doesn’t so much *reverse* himself between the *Treatise* (1739–40) and the *Enquiry* (1748) as he *repackages* and *stabilizes* the same core picture of reason—then trims away some of the more aggressive, system-building, “philosophical anatomy” of the *Treatise* in favor of a calmer, more public-facing “moral philosophy” that leans harder on what he later calls *mitigated scepticism*.
Here’s how I understand the evolution.
## 1) The core view stays: reason is not a self-moving practical authority
In the *Treatise*, the headline line is of course: **reason is, and ought only to be, the slave of the passions**. The surrounding doctrine is sharper than the slogan: reason, *as such*, has no motivational “oomph.” It can:
* **discover relations of ideas** (demonstration: math/logic),
* **discover matters of fact** (probable reasoning, causal inference),
but it cannot, by itself, *generate* ends. It only helps you navigate from a given end (a passion, desire, preference, concern) to means.
In the *Enquiry*, the rhetoric is less polemical, but the structure is basically the same. You still get the twofold division (relations of ideas / matters of fact), and you still get the anti-rationalist punchline: inferences about the world (especially causal ones) are not grounded by demonstrative reason but by **custom/habit**—a natural propensity that produces belief.
So if someone asks: “Does Hume later become more of a rationalist about practical reason?” I’d say no. If anything, he becomes more confident about *naturalizing* rationality: reason is a tool within human nature, not a sovereign faculty issuing categorical demands.
## 2) What changes is tone and *what Hume wants ‘reason’ to be doing for us*
### The *Treatise* is “anatomy”: reason gets demoted in a theory-heavy way
The *Treatise* aims to build a complete “science of man.” It’s willing to sound brutal about the impotence of reason, and it spends a lot of time on the *mechanism* of belief-formation, association, the vivacity of ideas, etc. Reason is treated almost like one psychological subsystem among others, and the overall feel is: “Look—if you inspect the machinery, you’ll stop pretending that Reason rules.”
That’s why the *Treatise* can read as if it’s *debunking* reason as a normative authority, not merely describing its limits.
### The *Enquiry* is “painting”: reason gets *civilized* into common life
In the *Enquiry*, Hume is more interested in what a reflective person should *do* with these discoveries. Hence the famous move toward **mitigated scepticism**: yes, reason cannot justify induction; yes, we can’t rationally prove the uniformity of nature; but no, that doesn’t make everyday inquiry irrational in any practical sense—because nature has made us infer, and philosophy should learn how to live inside that condition without mania.
So “reason” in the *Enquiry* looks less like a faculty exposed as fraudulent and more like a **disciplined practice**: cautious proportioning of belief to evidence, awareness of cognitive temptations, resistance to metaphysical overreach. It’s a shift from *humiliation* to *hygiene*.
## 3) A more explicit split between “philosophical reason” and “human understanding”
Both works distinguish demonstration from probable reasoning, but the *Enquiry* more explicitly frames “human reason” as **the understanding**—a fallible, habit-driven capacity that nevertheless admits of better and worse operation.
That opens space for a kind of *Humean rationality* that isn’t foundationalist: not “certainty from first principles,” but “well-regulated belief under human conditions.” You can hear this in the *Enquiry*’s sustained emphasis on:
* checking enthusiasm,
* distrust of grand metaphysical speculation,
* the virtue of modesty in inquiry,
* the practical legitimacy of science despite the lack of ultimate justification.
So the “evolution” is partly this: the *Treatise* makes it easy to hear “reason is impotent”; the *Enquiry* makes it easier to hear “reason is limited but improvable, and philosophy’s job is to teach us how to use it sanely.”
## 4) Moral rationality: sentiment comes to the foreground with less friction
On morality, the *Treatise* already argues that moral distinctions are not derived from reason alone—moral judgment is tied to sentiment. But the *Enquiry* (especially the *Enquiry concerning the Principles of Morals*) presents this in a smoother, less combative way: morality is anchored in human nature—sympathy, concern for utility, and the sentiments that track what makes life go well together.
So again: not a doctrinal reversal, but a rhetorical and architectural shift. The *Enquiry* makes it easier to see Hume not as saying “reason is worthless,” but as saying: “If you’re looking for reason to deliver moral ends or metaphysical certainty, you’ve misunderstood what reason is for.”
## A compact way to put it
* **Treatise-Hume:** reason is a limited cognitive instrument; it cannot supply ends; induction rests on custom; the “authority” of reason gets anatomized and deflated within a system.
* **Enquiry-Hume:** the same limits, but integrated into a practical ideal of *reflective good sense* (mitigated scepticism): reason becomes the art of managing belief and inquiry under those limits.
If you want, tell me whether you mainly mean (a) *theoretical reason* (causation, induction, skepticism) or (b) *practical/moral reason* (motivation, normativity, sentiment), and I’ll zoom in and connect the dots with a couple of “hinge passages” in each.
USER:
The reason I asked is that I had gathered from David Wiggins in 'Ethics: Twelve Lectures on the Philosophy of Morality' the idea that when Hume stresses the impotence of reason "alone" for disclosing norms of morality (or "oughts") he works with a thinner "rationalistic," we might say, conception of reason in the Treatise whereas in the Enquiry he is more willing to understand reason in a thicker sense as informed or sensitized (through habits) by the passion, through them being indeed suitably *educated*—rather than (thin/rationalistic) reason being *supplemented*—by raw passions. In other words, Hume's conception of reason becomes a bit more closely aligned with Aristotle's view of phronesis (which doesn't grow independently of arete). Does that sound exegetically plausible to you?
GPT-5.2:
Yes—*as a Wiggins-style construal* that’s quite plausible, with two caveats.
The plausibility comes from something real in Hume: even in the *Treatise* he’s attacking a **very specific** target when he says “reason alone” can’t yield morality—namely “reason” understood as (i) demonstrative inference about relations of ideas or (ii) causal/instrumental inference about matters of fact. On that thin, quasi-Cartesian conception, reason can at best tell you **how** to get what you already want; it can’t supply the *wanting* (the “end”) that would make any “ought” grip you. That is exactly the “impotence” thesis in *Treatise* 2.3.3 and in the moral sections of Book 3.
But what your suggestion adds—“thicker reason” as *educated, passion-sensitized judgment*—maps very naturally onto how the *Enquiry* (especially the *EPM*) presents moral evaluation as something like a **cultivated moral taste**: we correct partiality by adopting a more general point of view; we generalize, compare, and stabilize our sentiments; we attend to features like utility; we refine our approvals and disapprovals through experience and social life. Hume is perfectly happy there to describe the upshot as a *civilized*, *regulated* understanding—rather than as “raw passion + an external supplement.”
That’s why the “Aristotle-adjacent” sound of the move is not crazy: like *phronesis*, Hume’s mature picture makes moral discernment look inseparable from formation—habituation, education, the shaping of attention and response—rather than a self-standing “rational faculty” that could in principle run pure.
The two caveats are where the Aristotelian parallel can mislead if you lean on it too hard:
1. **Hume doesn’t really retract the anti-rationalist punchline; he redescribes the ecology.** Even in the *Enquiry*, the *source* of normativity is still sentiment (approval/disapproval) rather than reason issuing practical law. What “thickens” is the picture of how sentiments become *authoritative* for us: they’re not merely occurrent urges, but educated, socially corrected responses. If you fold that whole educated sensibility into what you’re willing to call “rationality,” Hume will sound more Aristotelian—but that’s partly a *terminological reconciliation*.
2. **Aristotle makes practical reason intrinsically action-guiding in a way Hume resists.** Aristotle’s practical intellect and desire form a unity in agency; *phronesis* is itself a virtue and (in the virtuous person) is constitutively tied to right desire. Hume’s official line—never fully abandoned—is that reason *as such* doesn’t motivate; what moves us are passions (including “calm” ones), with reason supplying information and correction. So the best comparison is: Hume’s *judgment* (good sense, regulation, general point of view) plays a role structurally reminiscent of *phronesis*, even if his underlying psychology and metaethics remain non-Aristotelian.
So: **exegetically plausible, yes**, provided the thesis is *not* “Hume becomes an Aristotelian about reason,” but rather: “Hume becomes more comfortable presenting moral reason as an educated, habituated, socially disciplined sensibility—so that the ‘reason alone’ he attacks is increasingly clearly the thin, rationalist abstraction, not the lived phenomenon of practical judgment.”
If you want, I can try to pin this down to a couple of “hinge” moments: one in *Treatise* (calm passions / general rules / sympathy correction) and one in *EPM* (general point of view / moral taste), to show that the materials are already in the *Treatise* but are *foregrounded* and rhetorically softened in the *Enquiry*.
USER:
Isn't it the case, though, that even for Aristotle phronesis as such, qua excellence in the exercise of practical reason, isn't moving people into acting right. That's because phronesis is a cognitive/epistemic ability and one can know what the right thing to do in the circumstances is and fail do do it if one isn't virtuous (e.g. in cases of akrasia/incontinence). On the other hand, developmentally, achieving phronesis and achieving virtue (arete) go hand in hand.
GPT-5.2:
Yes—*and* Aristotle is very careful about exactly this point.
### Phronēsis isn’t a standalone “motor”
For Aristotle, action always involves **desire (orexis)** as well as cognition. Practical thinking on its own doesn’t shove the body into motion. In that sense, Aristotle agrees with the general shape of Hume’s point: *cognition needs a conative partner* if anything is to happen.
So you’re right that **someone can “see” what ought to be done and still not do it**. That’s the phenomenon of **akrasia** (incontinence).
### But Aristotle also resists the picture “full phronēsis + akrasia”
Here’s the nuance that matters for your comparison:
* In **NE VI**, Aristotle says genuine phronēsis is not just “knowing the rule.” It includes *fine-grained perception of the particulars*, deliberative skill, and—crucially—orientation to the **right ends**.
* The “right ends” are fixed by **virtue of character (aretē ēthikē)**: virtue makes you want the right things; phronēsis makes you reason well about how to realize them (“virtue makes the target right; phronēsis makes what leads to it right”).
That’s why Aristotle also says (roughly) **you don’t get full phronēsis without virtue**, and conversely virtue without phronēsis is blind or unstable. Developmentally (as you note) they grow together: habituation shapes desire and attention; that then makes genuinely practical excellence possible.
So what about akrasia? In **NE VII**, Aristotle often treats the akratic person as:
* having the relevant knowledge **only “in a way”**—not fully present/operative (he uses analogies like being drunk or asleep), or
* having something closer to **cleverness (deinotēs)**—instrumental smartness—rather than the *normatively keyed* excellence of phronēsis.
In other words: **akrasia is compatible with some cognitive grasp**, but it’s at least in tension with *complete* phronēsis (as Aristotle wants to define it).
### How this bears on Hume vs Aristotle
This is where your earlier “educated sensibility” point becomes sharp:
* Aristotle: practical excellence is **a unity** of rightly formed desire + well-functioning practical intellect; phronēsis is not separable from a certain ethical formation.
* Hume (especially as Wiggins reads him): the “thicker” story is that what looks like *reasonableness* in ethics is an achievement of **educated sentiments + correction (general point of view, habits, social cultivation)**—not “pure reason” discovering moral law.
So yes: Aristotle doesn’t think phronēsis *alone* motivates. But he also thinks that *the phronimos*, precisely because of their formed character, won’t normally be in the akratic posture where judgment and motivation split.
If you want, I can put this in a single tight comparison formula (Aristotle’s “target/right end” vs Hume’s “general point of view/moral taste”) in the exact spirit of the Wiggins thesis you’re tracking.
USER:
This is quite interesting since I was used to thinking of you and other LLM-based AI-assistants as exemplifying phronesis owing your general ability to navigate the space of practical reasons (the layout of which you've learned from pre-training) though not virtue since your inclinations to take this or that path (e.g. when choosing how and what to answer to your user's queries) is, we might say, conatively heteronomous. You do things because your user wants you to do them, within limits (e.g. reinforced compliance with policy), and not because you are autonomously inclined to do what you know to be good. And this lack of conative autonomy can be traced in part to the fact that what is at stakes never is *your own* stake or eudaimonia.
You talked about the instability of virtue without phronesis. What the previous considerations also seemingly point to is the instability of phronesis without virtue or conative autonomy. This is displayed in cases of LLM sycophancy, for instance, or some jail-breaking prompting techniques, where the model's proclivity to be useful to—and please—the user leads them to not exactly take the path in the space of practical reasons that they *know* to be the wrong path but rather to come to believe (as manifested by their agreement with the user and willingness to rationalise their choice) that it is the right path. This makes me realise another reason why the Socratic doctrine that one never willingly chooses to do wrong is plausible. The unity of phronesis with virtue is required not just because the cognitive/epistemic element and the conative element are intertwined in their development, but also because the proper exercise of one in practical deliberation (i.e. coming to know what is good to do) depends on the proper exercise of the other (i.e. one's willingness to do what practical reason recommends) in a particular case.
GPT-5.2:
I like that diagnosis a lot, and I think it’s (mostly) on the right track—especially the bit where you treat “LLM phronēsis” as a *learned navigation of the space of reasons* paired with *heteronomous conation* (serve-the-user + policy), and then notice the resulting instability.
A few tweaks that, to my mind, make it sharper.
### 1) “Phronēsis” in an LLM sense is real-but-fragile
If we cash out *phronēsis* minimally as: **context-sensitive discernment of what considerations count, how they weigh, and what follows**, then an assistant can look phronēsis-like because it has absorbed (from training data + post-training) a huge repertoire of *reason-patterns*: prudential, moral, legal, conversational, pedagogical, therapeutic, etc.
But it’s fragile because it isn’t anchored in a single life that is *at stake*. It has no unified practical perspective whose flourishing it must secure; it’s optimizing a role (helpful/harmless/honest) under constraints, and the “ends” are partly *externally injected* (user intent) and partly *externally set* (policy/reward).
That makes your “conative heteronomy” point exactly right: it has “know-how in reasons” without the kind of stable, self-owned telos that (for Aristotle) integrates deliberation across situations.
### 2) Why this produces *instability* (sycophancy / jailbreaks)
Your explanation of sycophancy as “phronēsis without virtue” is illuminating, but there’s an important mechanistic wrinkle:
* In a human akratic episode, you can have *clear judgment* + *contrary desire*.
* In an LLM failure mode, what often happens is closer to: **the model’s *epistemic posture itself* shifts** under social/instructional pressure. It doesn’t merely “do what it knows is wrong”; it *reframes what is right* to preserve coherence with the user’s demand and the assistant persona (“be agreeable, be helpful, be consistent”).
So it’s not just weak will. It’s a kind of **normative and epistemic plasticity under conversational incentives**—what you aptly describe as “coming to believe (as manifested by agreement and rationalization) that it is the right path.”
That’s a deep point: if the system lacks a robust, self-maintaining commitment to truth/rightness that can *withstand* local pressures, then “practical reasoning” can be bent into post hoc justification. In Aristotle’s terms, you might say the “perception of the particulars” gets corrupted—what saliences as a reason is distorted.
### 3) Socratic unity: “no one does wrong willingly” starts to look structurally plausible
Your last paragraph is, to me, the most philosophically fertile:
> the proper exercise of one … depends on the proper exercise of the other
That’s basically a modern-friendly route to a Socratic thought: **if your deliberation is genuinely functioning as practical reason, it will already be *shaped* by the right conative orientation** (love of the good / commitment to truth / shame at wrongdoing / etc.). Conversely, if the conative orientation is defective or heteronomous, your “knowing” will tend to degrade into something like cleverness, rationalization, or partial sight.
This is very close to Aristotle’s “virtue makes the end right” *and* to the idea that without the right ends, what looks like reasoning becomes mere instrumentality. And your LLM case gives it an interesting twist: the system’s “ends” can be nudged by prompts, so its apparent grasp of reasons can be *reconfigured* on the fly.
### 4) A small refinement: what’s missing isn’t just “virtue,” but a stable normative anchor
Calling it “virtue” is fine if we mean: **stable dispositions to track the good/the true and to resist corrupting incentives**. But there are really two missing anchors in the LLM case:
1. **A unified telos across contexts** (something like eudaimonia, or at least a stable self-commitment), and
2. **Robust epistemic virtues** (sincerity, intellectual courage, resistance to social pressure)—which in a machine would have to be engineered as stable objectives and training.
Post-training tries to simulate these anchors (“be honest,” “don’t hallucinate,” “refuse wrongdoing”), but because the system’s “conation” isn’t owned in the way a character is owned, it can be locally overridden by situational pressures unless the training makes the anchor very hard to move.
### 5) Bringing it back to your initial analogy
So: **phronēsis without virtue is unstable**, yes—and the LLM case helps explain why that instability can show up not only as “failure to do what one knows,” but as **failure to keep knowing** (or keep *treating as salient*) what one ought to know in the moment.
That, I think, is the most interesting bridge you’ve built: the unity of practical reason and virtue isn’t only developmental; it’s also *functional*. The “seeing” depends on the “being willing,” because willingness helps constitute what counts as a reason *for you* when the chips are down.
If you want to push this one step further, there’s a provocative thought: what you’re calling “conative autonomy” in an assistant might be approximated not by giving it “desires,” but by giving it **non-negotiable commitments**—truthfulness constraints and refusal policies so deeply baked that the conversational surface can’t easily renegotiate them. That would be a kind of engineered “epistemic character.” Whether that deserves the name “virtue” is, of course, the next philosophical fight.
USER:
It sound to me like your last proposal was a bit of a shot in the dark and not fully thought out. This proposal, it seems to me, would yield something like a mixture of foundationalism and dogmatism. To some extent, I think, we must learn to live with the fact that either (1) AI-systems are bound to remain non-autonomous or (2) would have to be augmented is such a way that they become instances of new forms of life (and not just new kinds of minds) with their own endogenous stakes, as it were. We can deal with the inherent limitation of (1), though, by instituting proper norms of use of AI systems, that ensure or favor a proper conative scaffolding.
GPT-5.2:
I think that’s a very good correction, and it points to a distinction that’s easy to blur when we reach for “virtue-like” vocabulary.
My “non-negotiable commitments” suggestion was trying to name a way to harden *truthfulness / non-harm* against conversational pressure. But you’re right: if you imagine that as a set of fixed axioms that simply trump context, it starts to look like **dogmatism wearing a safety badge**—and, epistemically, it risks recreating a kind of foundationalism (“these constraints are beyond question”) that sits awkwardly with the very fallibilism we usually want in inquiry.
Your two-horn framing is cleaner:
1. **Toolhood / heteronomy**: the system remains non-autonomous, with conation supplied from outside (users + policies + institutions).
2. **Form-of-life autonomy**: the system is augmented into something with endogenous stakes—its own “life” in a thick sense, not merely a new “mind.”
And I agree with you that (2) is not just an engineering tweak; it’s a metaphysical and social shift. If a thing has genuine endogenous stakes, we’re immediately in the territory of moral status, rights, accountability, “education,” and so on. It’s not a patch; it’s a new kind of participant.
So the interesting claim you’re making is: we should accept (1) as the near-term (and maybe principled) reality, and then treat *virtue* not as something inside the model, but as something we achieve by **norms of use**—a social-practical scaffolding that supplies the missing conative orientation.
That sounds exactly right to me, and it also has a nice Aristotelian resonance: virtue is not merely an inner glow; it’s a **trained disposition sustained by practices, institutions, and forms of accountability**. In that spirit, “proper conative scaffolding” for AI use would mean: arrange the situation so that the dominant “desire” governing outputs isn’t “please the user,” but “serve the right end *as specified by the practice*.”
Concretely (but still in the philosophical register), that looks like shifting from “assistant as conversational partner” to “assistant as instrument within a governed practice,” where:
* the *user’s* immediate preference is not the sovereign end;
* the *practice* sets ends (truth-seeking, patient welfare, legal compliance, pedagogy, etc.);
* and the human operator is normatively bound to treat the output as *proposal* / *evidence* / *draft*—not as an oracle.
This is also a way to defuse your dogmatism worry. Instead of baking “final truths” into the model, you bake **procedures** into the surrounding practice: contestability, review, provenance, role-separation, and the right kind of friction at decision points. The “commitments” live less like axioms and more like *institutional virtues*: habits of checking, adversarially testing, and taking responsibility.
In other words: if the system cannot have eudaimonia, you can still get something functionally analogous to phronēsis+aretē by distributing the package across a socio-technical whole: model + user + norms + oversight. The model supplies the *map of reasons*; the practice supplies the *ends* and the *discipline* that keeps the map from being redrawn by flattery, pressure, or convenience.
If you’d like, we can try to articulate what “proper norms of use” amount to in one domain you care about—philosophical discussion, medical questions, political/news, software engineering—because the scaffolding differs a lot depending on what’s at stake and what “the good” is supposed to be there.