Substance theory
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| Substance theory | |
|---|---|
| Name | Substance theory |
| Era | Antiquity to Contemporary philosophy |
| Main subjects | Aristotle, René Descartes, John Locke |
| Regions | Ancient Greece, Medieval Europe, Early Modern period |
Substance theory is a metaphysical doctrine holding that certain entities—called substances—constitute the fundamental bearers of properties and the ultimate subjects of predication. It appears across traditions associated with figures such as Aristotle, Plotinus, Thomas Aquinas, René Descartes, Baruch Spinoza, and John Locke, and it has influenced debates in modern contexts involving thinkers like Immanuel Kant, G. W. F. Hegel, and David Lewis. Proponents treat substances as ontological grounders that explain persistence, change, and individuation, while critics include advocates of bundle theories and various forms of process metaphysics exemplified by Heraclitus and later by Alfred North Whitehead.
Definition and core concepts
Substance theory identifies substances as primary entities that underlie and bear properties, enabling predicates to be truthfully ascribed. Key concepts include: the substance–property distinction as articulated by Aristotle and systematized by Boethius; individuality and haecceity discussed by Duns Scotus; persistence through time as addressed by John Locke and Gottfried Wilhelm Leibniz; and the unity of the subject considered by Thomas Hobbes and David Hume. Related technical notions are essence and accident in debates involving Avicenna, Averroes, and William of Ockham; substratum as used by Pierre Gassendi; and the idea of divine substance in the work of Augustine of Hippo and Baruch Spinoza.
Historical development
Antiquity and Late Antiquity: Discussions begin in Ancient Greece with Plato’s Forms and Aristotle’s metaphysics, continue through Stoicism and Neoplatonism (notably Plotinus), and influence Early Christian theology figures such as Augustine of Hippo. Medieval period: Scholastic thinkers including Thomas Aquinas, Duns Scotus, William of Ockham, John Duns Scotus (note: same as Duns Scotus), Bonaventure, and Peter Abelard refine substance notions in relation to Christian doctrine and debates about universals. Early modern era: The rise of modern physics and market responses by philosophers such as René Descartes, who posits extended and thinking substances; Baruch Spinoza, who defends a monistic single substance; Gottfried Wilhelm Leibniz, who proposes monads; and empiricists like John Locke, who offers a corpuscular and substratum account. 19th–20th centuries: Reactions include Immanuel Kant’s critical philosophy, G. W. F. Hegel’s critique, and analytic challenges from David Hume, Bertrand Russell, and Willard Van Orman Quine; process alternatives emerge in the work of Alfred North Whitehead.
Metaphysical formulations and variants
Classical substantialism: As in Aristotle and Thomas Aquinas, substances are composite of form and matter and ground properties. Cartesian dualism: René Descartes distinguishes res cogitans and res extensa as two distinct substances. Spinozist monism: Baruch Spinoza reduces reality to a single infinite substance, God or Nature. Leibnizian pluralism: Gottfried Wilhelm Leibniz’s monads function as simple, windowless substances. Bundle theory opposition: Developed from critiques by David Hume and later revived by J. L. Mackie and others, bundle theories deny substrata. Substratum theories: Advocates like John Locke and Peter van Inwagen posit an underlying bearer that is not identical to its properties. Tropes and trope bundle theories: Advanced by figures such as D. M. Armstrong and David Armstrong as property particulars replacing substances. Process metaphysics: Influenced by Heraclitus and Alfred North Whitehead, this view treats events or processes as ontologically primary. Phenomenological and existential critiques: Thinkers like Edmund Husserl and Martin Heidegger reframe notions of subjectivity and being.
Major arguments and objections
Arguments for substance: Appeals to common-sense intuitions of persistence and individuation as found in John Locke; explanatory power regarding property-bearing exemplified in Aristotle; and metaphysical economy in Thomas Aquinas. Objections: The Humean critique denies any impression of substratum, leading to bundle theories advocated by David Hume and later analytic philosophers such as Frank Jackson. Mind–body complications: Cartesian substance dualism faces challenges from Princess Elizabeth of Bohemia’s correspondence and from contemporary neuroscience involving institutions like Harvard University and University of Cambridge. Parsimony and ontological commitment debates: Quinean criteria of ontological commitment from Willard Van Orman Quine and moral simplicity arguments by Occam affect acceptance. Problem of individuation and identity over time: Debated by Gottlob Frege and moderns like Peter van Inwagen and Ted Sider.
Influence on other philosophical areas
Philosophy of mind: Substance theory underpins dualist accounts such as those of René Descartes and invites alternatives like physicalism defended by J. J. C. Smart and Daniel Dennett. Metaphysics of modality and persistence: Influenced modal realism debates in the work of David Lewis and endurance–perduring disputes involving Ted Sider. Ethics and theology: Doctrines concerning personhood and ensoulment appear in writings by Thomas Aquinas, Augustine of Hippo, and contemporary ethicists at institutions like Princeton University. Philosophy of science: Debates about fundamentality and ontic structure intersect with the work of Imre Lakatos, Karl Popper, and Nancy Cartwright. Continental philosophy: Critiques and reworkings by Martin Heidegger and Jean-Paul Sartre influence existential and phenomenological conceptions of being.
Contemporary debates and applications
Current disputes concern the viability of substances in light of structural realism defended by scholars at University of Oxford and University of Cambridge, the role of tropes versus universal properties argued by philosophers such as D. M. Armstrong and Keith Campbell, and the prospects for emergent substance-like entities in philosophy of mind discussions by John Searle and David Chalmers. Applications appear in metaphilosophical methodology debates led by figures like Timothy Williamson and in interdisciplinary work linking metaphysics to cognitive science at centers such as Massachusetts Institute of Technology and Stanford University. Emerging work integrates substance-informed models with quantum ontologies debated by philosophers engaging with researchers at CERN and Perimeter Institute for Theoretical Physics.