The Body That Cannot Choose: Stoic Corporealism and the Case for Dualism Today
Theoretical foundations: Grant C. Sterling (Eastern Illinois University). Analysis and synthesis: Dave Kelly. Prose rendering: Claude (Anthropic). 2026.
The Body That Cannot Choose: Stoic Corporealism and the Case for Dualism Today
By Dave Kelly
A recent essay in this space, Judith Stove’s “Entering A Garden: Stoicism, Nature, and Metazoa,” makes a case that ought to be taken seriously: that ancient Stoic physics, in insisting that only bodies exist and that mind or soul is itself corporeal, anticipated the monism now fashionable in philosophy of mind and animal cognition studies. Stove is right about the ancient doctrine. Where the case runs into trouble is at the point where “the Stoics believed it” quietly becomes “and therefore we should too.” That step deserves scrutiny — not because the historical claim is wrong, but because the present-tense one does not follow from it, and the ancient Stoics themselves would have had little patience for an argument that treated a school’s physics as immune to revision by later evidence.
What the ancient Stoics actually held
Stove’s citations are accurate. Seneca’s quidquid facit corpus est — “whatever is active is a body” — is the load-bearing premise of Stoic ontology, and Diogenes Laertius’s account of the soul’s seven “tentacle-like” extensions from the hēgemonikon is genuine Stoic doctrine, not a poetic flourish borrowed from Oppian. Contemporary classicists confirm the reading without much dissent. Vanessa de Harven’s work on Stoic corporealism traces how the school’s dunamis criterion — being is the capacity to act or be acted upon — commits it to treating soul, tension, and even virtue as bodies of a particular kind, however strange that sounds to modern ears.1 Marcelo Boeri goes further, arguing that Stoic psychology anticipates the causal closure thesis at the center of contemporary physicalism: the Stoics rejected substance dualism for close to the same reason many analytic philosophers of mind do now — the apparent impossibility of an immaterial item exerting causal force on a material one.2 Massimo Pigliucci, who holds both a philosophy chair and a doctorate in evolutionary biology, states the position even more bluntly in his popular work: “the Stoics were materialists,” full stop, and he has argued in print that a scientifically responsible Stoicism today ought to inherit that materialism rather than quietly drop it.3 So Stove is not exercising private judgment here. She stands in company with working philosophers who have made the same case, some of them in professional, peer-reviewed terms.
This matters for what follows, because it means the disagreement is not between an amateur enthusiast and a rigorous tradition. It is a live dispute within the tradition itself, and it turns on a single question that none of the ancient texts can settle for us: does a plausible account of why the Stoics were corporealists in the third century BC give us any reason to be corporealists now?
Sterling’s reply
Grant Sterling addressed this question directly in a 2012 exchange on the International Stoic Forum, responding to a correspondent who had made essentially Stove’s move — citing the ancient doctrine that mind is “a state of matter” as though that settled the modern question. Sterling’s answer is worth quoting because it draws the line so precisely:
“My dualism is not developed in opposition to the ancient Stoic metaphysics, but to modern scientific physics. You say that for the ancient Stoics, the human mind is a ‘state of matter.’ The problem that I was bringing up is that there is no room in modern Physics for any such notion. Modern Physics recognizes only physical matter in the brain, consisting of various particles undergoing various electro-chemical processes. None of those particles or processes are understood as having characteristics like ‘the feeling of pain’ or ‘the concept of modus ponens.’”
The argument is narrower than it might first appear, and its narrowness is the point. Sterling does not dispute the history. He denies that a philosopher writing after the twentieth century’s advances in physics can help himself to Chrysippus’s pneuma the way Chrysippus could. The ancient Stoics were free to say mind is a fine, breath-like body permeating the coarser body, because nothing in their physics forbade matter from having such properties. Ours does. A particle physicist today has no category for “the concept of modus ponens” among the properties electrons and their interactions can bear, and no amount of appeal to pneuma closes that gap — it only relocates the mystery under a different name. Boeri’s own paper, read carefully, concedes as much: he does not claim the Stoics solved the interaction problem, only that they were dissatisfied with dualism for reasons that rhyme with contemporary physicalist dissatisfaction. Dissatisfaction with a difficulty is not the same as having dissolved it.
Why the difference is not academic
Stove’s essay treats corporealism as a scientific convenience — it “avoids many difficulties which continue to attend study of mind, when conceived as somehow distinct from… the body.” But the difficulties do not vanish; they migrate. If mental acts are simply a further arrangement of the same matter that composes rocks and rivers, then Epictetus’s opening move in the Enchiridion — “some things are in our control, others not; in our control are belief, impulse, desire, aversion” — needs an account of what “in our control” could mean for a state that is itself just one more link in a physical causal chain. A belief that is fully constituted by antecedent bodily states is not thereby exempted from the causal history of those states. It is one more event in the chain, however finely we describe its texture as “breath” rather than “electrochemistry.” The vocabulary changes; the determination does not.
This is the sense in which substance dualism, in Sterling’s reconstruction, is not an ornamental addition to Stoic ethics but its structural precondition. The rational faculty has to be a distinct kind of thing — not merely a distinctively organized body — if its judgments are to be genuinely its own rather than the terminal output of a causal sequence that began elsewhere. Stove’s essay, admirably, wants Stoicism’s ethics of agency and its physics of nature to hang together, and historically they did hang together, because the ancient Stoics were also, notoriously, close to determinists about the physical order even as they insisted assent was “up to us” — a tension their own contemporaries pressed them on. What Sterling’s dualism does is resolve that tension in the one direction the ancient corporealist could not: by taking the rational faculty out of the physical causal order the ancients otherwise wanted to make exhaustive.
A shared root, a divided branch
None of this diminishes what Stove has done well. Her essay is right that the Stoics saw human life as continuous with animal and even vegetative life through the two basic drives, right that Oppian’s octopus and Godfrey-Smith’s octopus are working the same vein of close, unsentimental attention to other minds, and right that this tradition has been underread relative to Aristotle’s. The corporealist premise and the continuity-of-nature premise are not the same claim, and a reader could accept the second — humans as embedded in a single biological order, oikeiōsis as a graded capacity running from instinct to reason — without accepting the first. Pigliucci, in fact, tends to run exactly this combination: full-throated materialism paired with an insistence that reason, however physically realized, still marks a genuine and consequential difference between human and animal oikeiōsis. Sterling would agree with the second half of that pairing and part ways on the first. That is where the argument now stands, and it is an argument, not a settled matter — which is, after all, the condition Stove’s own essay found the Stoics in when the subject was zoology rather than metaphysics of mind.
Notes
1. Vanessa de Harven, “The Metaphysics of Stoic Corporealism,” Elenchos.
2. Marcelo D. Boeri, “The Stoic Psychological Physicalism: An Ancient Version of the Causal Closure Thesis,” in R.A.H. King, ed., Common to Body and Soul.
3. Massimo Pigliucci, How to Be a Stoic (Basic Books, 2017); “The Stoic God Is Untenable in the Light of Modern Science,” The Side View, 2019.
Theoretical foundations: Grant C. Sterling (Eastern Illinois University). Analysis and synthesis: Dave Kelly. Prose rendering: Claude (Anthropic). 2026.
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