Classical Presupposition Audit — Peter Geach
Classical Presupposition Audit — Peter Geach
Instrument: Classical Presupposition Audit (CPA) v1.0. Instrument architecture and analysis: Dave Kelly. Theoretical foundations: Grant C. Sterling. Prose rendering: Claude. Document 65 in the Sterling/Kelly corpus. 2026.
Subject: Peter Thomas Geach (1916–2013), British analytic philosopher in the Thomistic tradition; Professor of Logic, University of Leeds; husband of G. E. M. Anscombe. Primary sources: Mental Acts (1957); Reference and Generality (1962); God and the Soul (1969); Logic Matters (1972); The Virtues (1977); Providence and Evil (1977); Truth, Love and Immortality: An Introduction to McTaggart’s Philosophy (1979).
Step 0 — Protocol Activation
Corpus in view. Sources restricted to Geach’s own published record. No prior conclusion stated. Geach is being audited within the Philosophy CPA cluster (Documents 65–70); cross-references to adjacent figures in the cluster (Anscombe, MacIntyre, Feser) are permitted where load-bearing for a finding but are not the primary basis of any finding.
Self-Audit Complete. Proceed to Step 1.
Step 1 — Presupposition Profile
P1 — The soul as the subject of psychological predicates. In God and the Soul, Geach argues that thinking and other mental acts cannot be identified with, or exhaustively explained by, any physical process. His argument targets the specific thesis that a description of brain states is an adequate account of mental acts: it is not, because mental acts have intentional properties — they are about something — that no physical description can supply. This is load-bearing for his entire account of mind, personal identity, and immortality.
P2 — Hylomorphic rather than Cartesian soul-body relation. The same argument, however, is explicitly Thomistic in its metaphysics of mind. The soul is the form of the body — the principle of life and rational activity — rather than a Cartesian res cogitans constituting a separate substance in its own right. Geach is explicit that Descartes’s account of personal identity, and of the soul as a substance capable of independent existence in the way a body is, is mistaken. This is also load-bearing: it is what distinguishes Geach’s position from Cartesian dualism at the point that matters for C1 specifically.
P3 — Genuine rational freedom of the will. Geach’s account of practical reason and voluntary action throughout The Virtues and Providence and Evil requires that genuine freedom of rational choice is real: acts of the will are the agent’s own in a sense not reducible to antecedent physical causation. This is load-bearing for his account of virtue, sin, and moral responsibility.
P4 — Thomistic natural law epistemology. In The Virtues, moral knowledge is acquired through practical reason operating on the teleological structure of human nature: recognizing what acts conduce to genuine human flourishing, abstracting from experience, and arriving at general practical principles through this process. This is load-bearing for Geach’s account of why the virtues are genuinely virtues rather than culturally contingent excellences.
P5 — Foundationalist logical and practical architecture. Geach’s logical work — especially Reference and Generality and Logic Matters — presupposes that genuine logical inference rests on self-evident first principles that cannot themselves be derived from anything more basic. The same structure governs his practical philosophy: the first principles of practical reason are foundational, not themselves conclusions of further argument.
P6 — Correspondence truth and robust moral realism. Geach’s entire philosophical record — his logic, his philosophy of language, his moral philosophy, and his theology — presupposes that true propositions correspond to mind-independent states of affairs, and that moral propositions are genuinely true or false in exactly this sense. Natural law ethics requires objective moral facts: not facts about what people happen to desire, but facts about what human nature teleologically requires.
Stage B — Domain Mapping. P1 and P2 are mapped together at C1 as two stages of a single account: P1 is the anti-physicalist argument (aligned with C1’s core claim), P2 is the metaphysical specification of how the rational soul is related to the body (the location of the residual). P4 is mapped at C3 specifically, checked against C3’s requirement for direct, non-inferential rational apprehension of moral truth rather than against the broader question of whether moral knowledge is possible. P5 and P6 are mapped at C4, C5, and C6 respectively.
Self-Audit Complete: presuppositions drawn from Geach’s own record; P1 and P2 deliberately kept distinct rather than merged into a single favorable or unfavorable finding; P4 held specifically to C3’s requirement rather than to the broader question of moral realism. Proceed to Step 2.
Step 2 — Commitment Audit
C1 — Substance Dualism. Partially Aligned. P1 is a genuine and argued anti-reductionist finding: mental acts cannot be adequately described in physical terms, the soul is the real subject of psychological predicates, and personal identity requires a continuing rational soul rather than a mere physical continuity. This is substantial correspondence with C1’s core anti-reductionist claim. The residual is P2: Geach’s soul is the form of the body, not a Cartesian substance constituting a distinct ontological kind with an independent natural mode of existence. The soul’s natural existence, on Geach’s own account, is as the form of a body — which is why he holds that human immortality requires divine resurrection rather than the soul’s natural persistence. This is the uniform Thomist residual found at C1 across the cluster (Anscombe, MacIntyre, Feser, Pellegrino) and it is genuine rather than a merely verbal difference from Cartesian dualism: hylomorphic form and Cartesian res cogitans are not the same metaphysical claim.
C2 — Libertarian Free Will. Aligned. P3 is load-bearing throughout Geach’s practical philosophy and his theology. Virtue requires genuine rational choice; sin requires genuine culpability; providence requires real created freedom rather than deterministic execution of the divine will. No contrary presupposition was found that qualifies this finding. Geach’s explicit engagement with the problem of divine foreknowledge and human freedom in Providence and Evil is resolved in favor of real human freedom rather than compatibilist accommodation, distinguishing his position from weaker residuals found elsewhere in the cluster.
C3 — Ethical Intuitionism. Partially Aligned. P4 requires that moral truth is objective and knowable by reason — substantial correspondence with C3’s requirement that moral truth be directly accessible to the rational faculty. The residual is the specific epistemological mechanism: Thomistic practical reason arrives at moral first principles through abstraction from experience and recognition of the teleological structure of human nature, rather than through direct, non-inferential apprehension of moral truth independent of natural-teleological reasoning. This is a genuine difference in kind from the intuitionist claim C3 requires at its core, not merely a matter of emphasis: Geach’s moral epistemology is naturalistic in its dependence on teleological human nature as the medium through which moral truth becomes knowable, where C3 requires that the rational faculty apprehend moral truth directly, without that mediating structure. This is the same residual found at C3 across the Thomist cluster, independently derived here on Geach’s own The Virtues rather than assumed from the pattern.
C4 — Foundationalism. Aligned. P5 is load-bearing throughout Geach’s logical and philosophical work. The first principles of logic are self-evident and foundational; the first principles of practical reason are foundational in the same sense. No holistic or coherentist qualification of this structure was found as load-bearing in his record.
C5 — Correspondence Theory of Truth. Aligned. P6’s correspondence commitment is presupposed uniformly across Geach’s logic, his philosophy of language (reference as genuine contact with mind-independent entities), and his moral philosophy (moral propositions as genuinely true or false). No deflationary or pragmatist qualification was found as load-bearing.
C6 — Moral Realism. Aligned. P6’s moral realism is the foundation of Geach’s entire practical philosophy. Natural law ethics requires that the moral facts it identifies — what genuine human flourishing requires and what acts are incompatible with it — be objective, mind-independent, and knowable by reason. No relativist or constructivist qualification was found as load-bearing.
Self-Audit Complete: all six presuppositions audited against all six commitments where they bear; both Partially Aligned findings specify the residual precisely and distinguish it from Contrary; the C3 finding was verified independently against Geach’s own text rather than assumed from the Thomist cluster pattern; no finding distributed for apparent balance — the table follows from the analysis. Proceed to Step 3.
Step 3 — Dissolution Finding
C1: Partially Aligned. C2: Aligned. Neither is Contrary. Per the dissolution rule: No Dissolution.
An agent who adopts Geach’s framework as a governing self-description retains a full account of genuine rational agency: a real soul that is the subject of his thoughts and choices, genuine freedom of the will, objective moral facts accessible to his reason, and a foundational architecture grounding both his logical and his moral inquiry. What he does not acquire from Geach’s framework alone is the Cartesian specification of the soul’s ontological independence from the body — the claim that C1 in its strongest form requires — and the direct, non-inferential moral apprehension C3 requires at its core. Both gaps are architectural rather than contradictory: nothing in Geach’s record closes either against the corpus.
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 | Partially Aligned |
| C4 — Foundationalism | Aligned |
| C5 — Correspondence Theory of Truth | Aligned |
| C6 — Moral Realism | Aligned |
Four Aligned (C2, C4, C5, C6), two Partially Aligned (C1, C3), zero Contrary, zero Inconsistent, zero Non-Operative. No Dissolution. The profile is the strongest in the Thomist sub-cluster alongside Feser (Document 67) in terms of Aligned count. Deepest point of divergence: the C1/C3 pair, both carrying the same underlying Thomist residual — a metaphysics and an epistemology organized around natural teleology rather than around the ontological independence of the rational faculty that Sterling’s framework requires at both commitments.
Part B — Dissolution Finding. No Dissolution. C1 Partially Aligned, C2 Aligned. The framework fully preserves the space for a self-governing rational faculty whose acts of will are genuinely its own.
Part C — Agent-Level Implication. An agent who adopts Geach’s framework acquires a rigorous, argued anti-reductionist account of mind (C1, partially), the strongest explicitly argued case for genuine human freedom relative to divine providence in the Thomist cluster (C2), a fully foundationalist logical and practical architecture (C4), correspondence truth as the governing standard (C5), and a thoroughgoing natural-law moral realism (C6). What the framework leaves requiring supplementation is C1’s Cartesian specification — the soul’s ontological independence from the body — and C3’s direct moral apprehension, which Geach’s naturalistic-teleological moral epistemology approaches in its conclusions without reaching in its method. Both gaps are consistent with supplementation from within the corpus; nothing in Geach’s record closes them against it.
Corpus boundary. The CPA issues findings on presuppositions embedded in an argumentative record. It does not evaluate Geach’s standing within analytic philosophy, the historical influence of his work in reviving Thomism within the analytic tradition, or the adequacy of his logical contributions to the theory of reference.
Self-Audit Complete: summary follows from Steps 1–3 without new material introduced; 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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