Sterling and the Contemporary Proponents — Argument Correspondence Map C5 — Ethical Intuitionism: Sterling and Huemer
Sterling and the Contemporary Proponents — Argument Correspondence Map
C5 — Ethical Intuitionism: Sterling and Huemer
Analysis: Dave Kelly, 2026. Theoretical framework: Grant C. Sterling. Prose rendering: Claude.
I. The Sterling Argument
The governing corpus passages are Stoicism, Moral Facts, and Ethical Intuitionism (Sterling, ISF March 13, 2020 — Message Five), Stoicism, Foundationalism, and the Structure of Ethical Knowledge (Sterling, ISF January 19, 2015), and Stoicism, Moral Realism, and the Necessity of Objective Moral Facts (Sterling, ISF May 26, 2021). The C5 analytical essay (Kelly, 2026 from Sterling’s theoretical foundations) provides the systematic elaboration.
Sterling’s argument for ethical intuitionism proceeds on three tracks: an argument from the nature of moral properties, an argument from the elimination of alternatives, and an argument from the mathematical analogy.
The argument from the nature of moral properties:
Premise One: Moral terms — good, evil, right, wrong, virtue, vice — cannot be heard, smelt, tasted, seen, or felt. They are not sensory properties. No accumulation of empirical observations, however large, produces a moral conclusion without a moral premise already present in the chain.
Premise Two: If moral properties cannot be sensed, then moral knowledge cannot be grounded in sensory experience. The is/ought gap cannot be bridged by any accumulation of empirical premises without a non-sensory moral premise. Any account of moral knowledge that grounds it in sensory experience either imports a moral premise covertly or fails to produce moral knowledge at all.
Premise Three: Moral truths are necessary, not contingent. They have no source in the way empirical facts do, just as 2+2=4 has no source. They could not have been otherwise. Necessary truths are not the kind of thing discovered by sensory observation of how things contingently are.
Conclusion A: Moral knowledge is not empirical knowledge. It requires a non-sensory epistemic access to necessary moral truths. That access is direct rational apprehension — the same rational faculty that grasps mathematical and logical truths grasps moral truths.
The elimination of alternatives argument:
Premise One: Sterling identifies four sources of knowledge: sensory experience (a), extra-sensory experience (b), rational perception of self-evidence (c), and purely innate knowledge (d). Moral knowledge is not (a) — moral properties cannot be sensed. It is not (b) — Sterling does not invoke extra-sensory perception. It is not (d) — it is not built into the mind at birth without any rational act.
Premise Two: Category (c) — rational perception of self-evidence — is foundationalism’s and intuitionism’s epistemological home. It is the category of knowledge in which the rational faculty directly apprehends truths that are self-evident: truths whose denial produces immediate recognition of impossibility or absurdity.
Conclusion B: Moral knowledge belongs to category (c). The alternatives to intuitionism are intuitionism or nihilism — there is no third option. Either moral truths are directly apprehensible by the rational faculty, or there is no moral knowledge at all.
The mathematical analogy:
Premise One: We know that 2+2=4 and that from “If p, then q” and “p” we can deduce “q.” We know these things by using Reason — not by sensory experience, not by empirical observation, not by social consensus. The rational faculty directly apprehends necessary truths.
Premise Two: Moral truths are necessary truths of the same modal status as mathematical and logical truths. They could not have been otherwise. They have no empirical source.
Conclusion C: We know moral truths by Reason in the same way we know mathematical and logical truths — by the same rational faculty, exercising the same direct apprehension of necessary truth. The moral case is complicated by the fact that we have developed bad habits since childhood of believing that things that benefit us are good, so we tend to deny obvious moral truths when they are inconvenient. But the faculty that apprehends them is the same.
Sterling’s argument compressed:
- Moral properties cannot be heard, smelt, tasted, seen, or felt.
- The is/ought gap cannot be bridged by empirical premises alone.
- Moral truths are necessary, not contingent — they have no empirical source.
- The alternatives to intuitionism are intuitionism or nihilism — no third option.
- We know moral truths by Reason in the same way we know mathematical and logical truths.
- Moral knowledge is direct rational apprehension of necessary moral truths — intuitionism.
II. The Huemer Argument
The governing text is Michael Huemer, Ethical Intuitionism (Palgrave Macmillan, 2005).
Huemer defends ethical intuitionism through his principle of phenomenal conservatism and a systematic refutation of alternative metaethical positions. His argument proceeds by establishing that moral intuitions are evidence for moral claims, then defending this claim against the standard objections.
The phenomenal conservatism argument:
Premise One: Phenomenal conservatism is the epistemological principle that if something seems true to a rational agent in the absence of any defeater, that seeming constitutes prima facie justification for believing it. The seeming is evidence for the truth of what seems to be the case.
Premise Two: Moral intuitions are seemings — things that seem morally true to a rational agent. When an action seems wrong, that seeming is evidence that it is wrong. The evidence is defeasible — it can be overridden by stronger contrary evidence — but it is genuine evidence. It is not mere feeling, mere preference, or mere cultural conditioning.
Premise Three: The alternative to phenomenal conservatism is global skepticism. If seemings never constitute prima facie justification, then no belief is ever justified — because all justification ultimately rests on something that seems true to the rational agent. Rejecting phenomenal conservatism universally destroys the possibility of justified belief, including the belief that phenomenal conservatism is false. The position is self-defeating.
Conclusion A: Moral intuitions constitute genuine prima facie evidence for moral claims. The rational agent who withholds all weight from moral intuitions has no principled basis for his withholding that does not equally destroy the justification of his empirical beliefs.
The refutation of alternatives:
Against non-cognitivism: Non-cognitivism holds that moral claims do not express beliefs but attitudes, emotions, or prescriptions. Huemer argues that moral discourse has the logical structure of cognitive discourse — moral claims can be negated, embedded in conditionals, and used in valid arguments. Non-cognitivism cannot account for the logical behavior of moral language.
Against subjectivism: Subjectivism holds that moral claims report the speaker’s attitudes. Huemer argues that moral disagreement would then be impossible — two people reporting their different attitudes are not disagreeing. But moral disagreement is real. Subjectivism cannot account for it.
Against relativism: Relativism holds that moral claims are true or false relative to a culture or individual. Huemer argues that this makes moral progress impossible — a culture that changes its moral views has not improved; it has merely changed. But moral progress is real. Relativism cannot account for it.
Against naturalism: Naturalism holds that moral properties are identical to natural properties. Huemer endorses Moore’s open question argument: for any natural property N, it remains an open question whether N is genuinely good. Moral properties are not natural properties.
Conclusion B: The alternatives to intuitionism all fail. Intuitionism — the view that moral intuitions are genuine evidence for moral truths apprehended directly by the rational faculty — is the only metaethical position that accounts for the logical behavior of moral language, the reality of moral disagreement, the possibility of moral progress, and the non-identity of moral and natural properties.
Huemer’s argument compressed:
- Seemings constitute prima facie evidence for what seems to be the case (phenomenal conservatism).
- Rejecting phenomenal conservatism universally destroys justified belief — the position is self-defeating.
- Moral intuitions are seemings and therefore constitute genuine prima facie evidence for moral claims.
- Non-cognitivism, subjectivism, relativism, and naturalism all fail to account for the logical behavior of moral discourse.
- Intuitionism is the only metaethical position that survives the elimination of alternatives.
- Moral truths are directly apprehensible by the rational faculty — intuitionism is correct.
III. Correspondence Finding
Point of structural identity — the elimination of alternatives: Both Sterling and Huemer make the same foundational argumentative move: the alternatives to intuitionism are eliminated, leaving intuitionism as the only surviving account of moral knowledge. Sterling’s elimination is compact — intuitionism or nihilism, no third alternative. Huemer’s elimination is comprehensive — non-cognitivism, subjectivism, relativism, and naturalism are each refuted in turn. Both arrive at the same conclusion by the same method: the alternatives fail, and intuitionism is what remains. This eliminative structure is the architecturally decisive argumentative move that both philosophers share.
Point of structural identity — the non-sensory character of moral knowledge: Both Sterling and Huemer establish that moral knowledge is not sensory knowledge. Sterling’s route: moral terms cannot be heard, smelt, tasted, seen, or felt; moral properties are not accessible through sensory experience; the is/ought gap cannot be bridged by empirical premises alone. Huemer’s route: the open question argument establishes that moral properties are not natural properties; since natural properties are what sensory experience tracks, moral properties are not accessible through sensory experience. Both arrive at the same structural conclusion: moral knowledge requires a non-sensory epistemic access to moral reality.
Point of structural identity — moral intuitions as genuine evidence: Both Sterling and Huemer hold that direct rational apprehension of moral truth constitutes genuine knowledge rather than mere feeling or preference. Sterling’s claim: we know moral truths by Reason in the same way we know mathematical and logical truths — the direct apprehension is knowledge in the strict philosophical sense. Huemer’s claim: moral intuitions are prima facie evidence for moral claims through phenomenal conservatism — the seeming is genuine evidence, not mere feeling. Both are making the same claim: what the rational faculty directly apprehends morally is not mere psychological state but epistemic contact with moral reality.
Point of divergence — the mathematical analogy: Sterling’s most distinctive contribution to C5 is the mathematical analogy: the same rational faculty that gives knowledge of mathematical and logical truths gives knowledge of moral truths. This analogy establishes the modal status of moral knowledge — necessary, a priori, non-empirical — by connecting it to the clearest case of non-empirical necessary knowledge. Huemer does not make this analogy central to his account. His phenomenal conservatism is a general epistemological principle that applies to all seemings, not specifically to the class of necessary truths. Sterling’s account is more restrictive and more precise: moral knowledge is specifically the direct apprehension of necessary truths, not just any seeming that lacks a defeater. The mathematical analogy is Sterling’s original contribution to C5 and is not carried over by the correspondence.
Point of divergence — the Stoic application: Sterling’s intuitionism is specifically applied to the foundational Stoic theorems: Theorem 10 (virtue is the only genuine good), Theorem 12 (externals are neither good nor evil), and their derivatives. The rational faculty’s direct apprehension of these theorems is what makes the Examination step possible and authoritative. Huemer’s intuitionism is general — it applies to any moral intuition that lacks a defeater, across any moral content. The Stoic-specific application of C5 to the foundational theorems is Sterling’s own contribution and is not present in Huemer.
Overall correspondence finding: The load-bearing argumentative moves are structurally equivalent. Both Sterling and Huemer eliminate the alternatives to intuitionism, establish the non-sensory character of moral knowledge, and hold that direct rational apprehension of moral truth constitutes genuine evidence rather than mere feeling. Huemer’s phenomenal conservatism provides a rigorous epistemological grounding for the prima facie evidential status of moral intuitions that supplements Sterling’s more compact argument. Sterling’s mathematical analogy — establishing the necessary, a priori character of moral knowledge by connecting it to the clearest case of non-empirical necessary knowledge — is a distinct and original contribution not present in Huemer and not carried over by the correspondence. Sterling’s application of C5 to the specific foundational theorems of Core Stoicism is equally original and not carried over.
Sterling and the Contemporary Proponents — Argument Correspondence Map. C5: Ethical Intuitionism. Analysis: Dave Kelly, 2026. Theoretical framework: Grant C. Sterling. Prose rendering: Claude.
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