Classical Presupposition Audit — John Finnis
Instrument: Classical Presupposition Audit (CPA) v1.0. Instrument architecture and analysis: Dave Kelly. Theoretical foundations: Grant C. Sterling. Prose rendering: Claude. Sterling/Kelly corpus. 2026.
Subject: John Finnis (1940–), Emeritus Professor of Law and Legal Philosophy, University of Oxford; Biolchini Family Professor of Law, University of Notre Dame. Primary sources: Natural Law and Natural Rights (1980); Fundamentals of Ethics (1983); Moral Absolutes (1991); Aquinas: Moral, Political, and Legal Theory (1998); Intention and Identity (2011); Collected Essays, 5 vols. (2011).
Prior corpus standing. Named in the CRI as one of the most fully aligned contemporary philosophers.
Step 0 — Protocol Activation
Corpus in view. Sources restricted to Finnis’s own argumentative record. No prior conclusion stated. Subject is a professional philosopher and legal theorist; the Political Application Constraint does not apply.
Self-Audit Complete. Proceed to Step 1.
Step 1 — Presupposition Profile
P1 — Persons as rational agents irreducible to physical systems. Finnis’s natural law framework requires that the basic goods — life, knowledge, play, aesthetic experience, sociability, practical reasonableness, religion — are goods of persons, not of organisms considered purely as physical systems. His argument against consequentialism requires that persons cannot be reduced to bundles of physical states whose outcomes are to be aggregated: persons have a dignity that cannot be traded off, which presupposes they are not merely physical systems. His Thomistic inheritance provides the hylomorphic account of the soul as form of the body: not Cartesian substance dualism, but equally not physicalist reductionism, preserving the genuine ontological reality of the rational faculty as distinct from matter considered alone. His entire practical reason framework presupposes that the rational faculty is a genuine apprehending and directing power, not a computational output of prior physical states.
P2 — Free choice as self-determination under incommensurable goods. Finnis’s account of practical reason requires genuine free choice as a structural premise. Natural Law and Natural Rights identifies practical reasonableness as itself one of the basic goods, and the framework of self-direction — choosing among incommensurable basic goods, forming a coherent life plan, acting for reasons rather than from causes — presupposes that the agent’s choice is genuinely his own and not determined by prior physical states. The incommensurability of basic goods is load-bearing here: precisely because no basic good is reducible to any other or to a common currency that could be maximized, genuine choice rather than calculation is required. His Thomistic account of the will as a rational appetite that moves itself in response to reasons presupposes incompatibilist agency. His moral absolutes require that agents genuinely choose to perform or avoid intrinsically wrong acts: a determined agent cannot be absolutely prohibited from anything, because prohibition has no purchase on a causally determined outcome.
P3 — Basic goods as per se nota: directly apprehended without inference. In Natural Law and Natural Rights, Finnis argues that the basic goods are self-evidently good — known by practical reason directly, not derived from metaphysical premises about human nature or divine command. This is the most discussed and contested feature of new natural law theory, marking its explicit break from the traditional Thomistic derivation of ought from is. The first principles of practical reason — that knowledge is good, that life is good, that practical reasonableness is good — are per se nota: known of themselves, not inferred. The apprehension is not empirical, not inferential, and not culturally conditioned in its foundational form. This is structurally equivalent to ethical intuitionism: the rational faculty directly apprehends that certain things are genuinely worth pursuing.
P4 — Foundationalist practical reason architecture. All practical reasoning about what to do traces back to the basic goods as the ultimate justifying reasons for action. No practical conclusion is justified by infinite regress or by a coherentist web of mutual support: it terminates in a basic good that is known per se nota. Finnis’s epistemology of practical reason mirrors his epistemology of theoretical reason — both require basic propositions that are self-evident and do not derive their justificatory force from prior propositions. Foundationalism is structurally load-bearing throughout his system.
P5 — Correspondence truth as the governing standard throughout. Finnis’s defense of moral absolutes requires that certain moral propositions are genuinely true — not merely approved or useful — because they correspond to the real moral structure of persons and actions. His critique of consequentialism requires that the consequentialist’s claim is false, not merely inconvenient. His natural law critique of legal positivism requires that law’s claim to moral authority is either genuine or not, which presupposes a correspondence standard against which that claim is assessed. His account of practical reason as reason apprehending real goods presupposes that the apprehension either succeeds or fails in tracking what is actually there.
P6 — Basic goods as real, moral absolutes as objectively true, law as genuinely unjust or not. Finnis’s entire philosophical program is built on moral realism at its most demanding: basic goods are real goods, not preferences or culturally endorsed values; moral absolutes are objectively true regardless of consequences or cultural context; law can be genuinely unjust, not merely disliked, which presupposes objective moral standards against which law is measured. His Thomistic inheritance reinforces this: the natural law tradition is the longest-standing systematic defense of moral realism in Western philosophy.
Stage B — Domain Mapping. P1 is mapped at C1: the person as rational agent irreducible to physical systems, with the hylomorphic residual identified and carried into Step 2. P2 is mapped at C2: free choice as self-determination, specifically the incommensurability argument and the moral-absolutes requirement. P3 is mapped at C3: per se nota basic goods as direct moral apprehension. P4 is mapped at C4: foundationalist architecture terminating in basic goods. P5 is mapped at C5: correspondence truth throughout. P6 is mapped at C6: moral realism at its most demanding.
Self-Audit Complete: all presuppositions traced to load-bearing argumentative moves; the hylomorphic residual identified precisely at P1 and carried into Step 2 rather than suppressed; P3’s explicit break from traditional Thomistic derivation noted as the load-bearing basis for the C3 finding. Proceed to Step 2.
Step 2 — Commitment Audit
C1 — Substance Dualism. Partially Aligned. P1 requires throughout that the rational faculty is a genuine apprehending and directing power, not a computational output of prior physical states — substantial, pervasive correspondence with C1’s core anti-reductionist claim. The residual is that Finnis’s Thomistic hylomorphism is not Cartesian substance dualism: it treats mind and body as form and matter of one substance rather than as two separate substances, and this difference is load-bearing in his Thomistic account of the unity of the person. The functional alignment is clear; the precise metaphysical architecture differs from the Cartesian dualism Sterling’s C1 names. Partially Aligned rather than Aligned on this basis — the same residual found across the Thomist cluster (Geach, MacIntyre, Feser, Anscombe).
C2 — Libertarian Free Will. Aligned. P2’s incommensurability argument is distinctive and load-bearing: precisely because the basic goods cannot be reduced to a common currency, genuine choice rather than maximization is required at every significant practical juncture, and this requirement builds libertarian self-determination structurally into the framework rather than presupposing it from outside. Moral absolutes require genuine agency: a determined agent cannot be absolutely prohibited from anything in the morally significant sense Finnis requires. The will’s Thomistic self-movement in response to reasons presupposes incompatibilist agency. No contrary presupposition qualifies this finding.
C3 — Ethical Intuitionism. Aligned. P3’s per se nota account of the basic goods is direct moral apprehension: the rational faculty knows them immediately without inference from metaphysical premises or empirical observation. Finnis argues this explicitly and at length, and it is the foundational move distinguishing new natural law theory from traditional Thomism. This distinguishes Finnis’s C3 finding from the Partially Aligned Thomist C3 residual found in Geach, MacIntyre, Feser, and Anscombe, all of whom mediate moral knowledge through natural teleology or tradition rather than arriving at it by direct apprehension of self-evident principles. The explicit, argued, load-bearing per se nota claim earns Aligned here where the naturalistic-teleological mediation of the others earns only Partially Aligned.
C4 — Foundationalism. Aligned. P4’s basic goods as foundational self-evident principles of practical reason constitute an explicitly foundationalist architecture. All practical justification traces to them; no coherentist web of mutual support substitutes for foundational bedrock. No contrary presupposition qualifies this finding.
C5 — Correspondence Theory of Truth. Aligned. P5 is presupposed uniformly throughout Finnis’s moral, legal, and practical-reason record. Moral absolutes are genuinely true; consequentialism is genuinely false; law is genuinely unjust or not. No deflationary or pragmatist qualification appears as load-bearing.
C6 — Moral Realism. Aligned. P6’s moral realism is the most explicit and demanding in the cluster. Basic goods are real; moral absolutes are objectively true regardless of consequences or cultural context; law can be genuinely unjust. The commitment is argued across Finnis’s entire career and is the foundation of both his legal and his moral philosophy.
Self-Audit Complete: all six commitments audited without selective treatment; C3 Aligned finding explicitly distinguished from the Thomist cluster’s usual C3 Partially Aligned on the basis of Finnis’s own explicit per se nota argument, which the other Thomists do not make; C1 Partially Aligned finding verified as the same hylomorphic residual found independently across the cluster; no finding distributed for apparent balance. Proceed to Step 3.
Step 3 — Dissolution Finding
C1: Partially Aligned. C2: Aligned. Neither is Contrary. Per the dissolution rule: No Dissolution.
Finnis’s framework does not require those who adopt it to dissolve their prohairesis into an external system. His hylomorphic account of the rational faculty preserves its genuine ontological reality and causal efficacy against reductionist dissolution, even while differing from Cartesian substance dualism in its metaphysical architecture. His libertarian free will commitment fully preserves genuine originating agency. An agent who adopts Finnis’s framework retains a self-description in which the rational faculty is real, the will is genuinely self-moving, and choices originate in the agent rather than in prior physical causes.
Self-Audit Complete. Proceed to Step 4.
Step 4 — Summary Finding
Part A — Commitment Pattern
| Commitment | Finding |
|---|---|
| C1 — Substance Dualism | Partially Aligned |
| C2 — Libertarian Free Will | Aligned |
| C3 — Ethical Intuitionism | Aligned |
| C4 — Foundationalism | Aligned |
| C5 — Correspondence Theory of Truth | Aligned |
| C6 — Moral Realism | Aligned |
Five Aligned (C2, C3, C4, C5, C6), one Partially Aligned (C1), zero Contrary, zero Inconsistent, zero Non-Operative. No Dissolution. Among the highest alignment counts in the entire Ethics/Philosophy cluster, matching Feser (Document 67) at five Aligned. The single Partially Aligned finding at C1 carries the hylomorphic residual uniform across the Thomist cluster. Finnis breaks the cluster’s C3 pattern decisively: where Geach, MacIntyre, Feser, and Anscombe all land at Partially Aligned at C3 because their moral epistemology mediates through natural teleology or tradition, Finnis’s explicit per se nota argument for the basic goods earns Aligned at C3, making him the only Thomist in the cluster to do so. Strongest alignment: C3 and C6, where Finnis provides the most systematically developed natural law defense of moral realism and the most explicit contemporary argument for direct apprehension of basic moral goods. Deepest point of divergence: C1 alone — hylomorphism preserves what the corpus requires functionally while differing in metaphysical architecture.
Part B — Dissolution Finding. No Dissolution. C1 Partially Aligned, C2 Aligned. The framework fully preserves the space for a self-governing rational faculty whose choices are genuinely its own.
Part C — Agent-Level Implication. An agent who adopts Finnis’s framework acquires the most fully developed natural law defense of moral realism available in contemporary analytic jurisprudence and moral philosophy (C6), a rigorously argued per se nota account of direct moral apprehension that earns Aligned at C3 where every other Thomist in the cluster reaches only Partially Aligned (C3), an explicitly foundationalist practical reason architecture (C4), correspondence truth as the governing standard throughout (C5), and a robust libertarian account of free choice grounded in the incommensurability of basic goods (C2). The one point requiring supplementation is C1: Finnis’s hylomorphic account preserves the genuine reality of the rational faculty but does not carry the full Cartesian substance dualist architecture. An agent working within the corpus who adopts Finnis’s framework would find it the most nearly complete alignment available among contemporary natural law philosophers, with the metaphysics of mind as the single point requiring explicit supplementation. Nothing in Finnis’s record closes C1 against the corpus — the gap is architectural rather than contradictory, and supplementation from Feser’s argued substance dualism (Document 67) is architecturally consistent.
Corpus boundary. The CPA issues findings on presuppositions embedded in an argumentative record. It does not evaluate the adequacy of new natural law theory as a legal philosophy, the success of Finnis’s critique of legal positivism, or the internal debates between new natural law theory and traditional Thomism.
Self-Audit Complete: summary follows from Steps 1–3 without new material introduced; the C3 Aligned finding’s distinction from the cluster pattern was stated in Part A and Part C rather than left to implication; the Feser supplementation suggestion was verified as architecturally consistent rather than asserted; agent-level implication addressed to a prospective adopter; corpus boundary declared; summary self-contained. CPA run complete.
Theoretical foundations: Grant C. Sterling. Instrument architecture and analysis: Dave Kelly. Prose rendering: Claude.
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