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Hylomorphism (or hylemorphism) is a philosophical theory developed by Aristotle, which conceives being (ousia) as a compound of matter and form.

The word is a 19th-century term formed from the Greek words ὕλη hyle, "wood, matter" and μορφή, morphē, "form."


  • Matter and form 1
  • Substantial form, accidental form, and prime matter 2
  • Body–soul hylomorphism 3
    • Basic theory 3.1
    • Living bodies 3.2
    • Intellect 3.3
  • Universal hylomorphism 4
  • Medieval modifications 5
    • Plurality vs. unity of substantial form 5.1
    • Thomistic dualism 5.2
  • Teleology and ethics 6
  • Modern physics 7
  • See also 8
  • Notes 9
  • Sources 10
  • External links 11

Matter and form

Aristotle defines X's matter as "that out of which" X is made.[1] For example, letters are the matter of syllables.[2] Thus, "matter" is a relative term:[3] an object counts as matter relative to something else. For example, clay is matter relative to a brick because a brick is made of clay, whereas bricks are matter relative to a brick house.

Change is analyzed as a material transformation: matter is what undergoes a change of form.[4] For example, consider a lump of bronze that's shaped into a statue. Bronze is the matter, and this matter loses one form (that of a lump) and gains a new form (that of a statue).[5][6]

According to Aristotle's theory of

  • hylomorphism (philosophy) -- Encyclopedia Britannica

External links

  • Aristotle.
    • Metaphysics
    • Nichomachean Ethics
    • On the Soul.
    • Physics
  • Caston, Victor.
    • "Aristotle's Psychology". A Companion to Ancient Philosophy. Ed. Mary Gill and Pierre Pellegrin. Hoboken: Wiley-Blackwell, 2006. 316-46.
    • "Aristotle's Two Intellects: A Modest Proposal". Phronesis 44.3 (1999): 199-227.
  • Cross, Richard. The Physics of Duns Scotus. Oxford: Oxford UP, 1998.
  • Eberl, Jason T. "Aquinas on the Nature of Human Beings." The Review of Metaphysics 58.2 (November 2004): 333-65.
  • Gilson, Etienne. The Philosophy of St. Bonaventure. Trans. F. J. Sheed. NY: Sheed & Ward, 1938.
  • Irwin, Terence. Aristotle's First Principles. Oxford: Oxford UP, 1990.
  • Keck, David. Angels & Angelology in the Middle Ages. NY: Oxford UP, 1998.
  • Kenny, Anthony. Aquinas on Mind. London: Routledge, 1993.
  • Leftow, Brian.
    • "Souls Dipped in Dust." Soul, Body, and Survival: Essays on the Metaphysics of Human Persons. Ed. Kevin Corcoran. NY: Cornell UP, 2001. 120-38.
    • "Soul, Mind, and Brain." The Waning of Materialism. Ed. Robert C. Koons and George Bealer. Oxford: Oxford UP, 2010. 395-417.
  • McEvilley, Thomas. The Shape of Ancient Thought. NY: Allworth, 2002.
  • Mendell, Henry. "Aristotle and Mathematics". Stanford Encyclopedia of Philosophy. 26 March 2004. Stanford University. 2 July 2009 .
  • Normore, Calvin. "The Matter of Thought". Representation and Objects of Thought in Medieval Philosophy. Ed. Henrik Lagerlund. Hampshire: Ashgate, 2007. 117-133.
  • Pasnau, Robert. Thomas Aquinas on Human Nature. Cambridge: Cambridge UP, 2001.
  • Robinson, Timothy. Aristotle in Outline. Indianapolis: Hackett, 1995.
  • Shields, Christopher.
    • "A Fundamental Problem about Hylomorphism". Stanford Encyclopedia of Philosophy. Stanford University. 29 June 2009 .
    • Aristotle. London: Routledge, 2007.
    • "Some Recent Approaches to Aristotle's De Anima". De Anima: Books II and III (With Passages From Book I). Trans. W.D. Hamlyn. Oxford: Clarendon, 1993. 157-81.
    • "Soul as Subject in Aristotle's De Anima". Classical Quarterly 38.1 (1988): 140-49.
  • Stump, Eleanore.
    • "Non-Cartesian Substance Dualism and Materialism without Reductionism." Faith and Philosophy 12.4 (October 1995): 505-31.
    • "Resurrection, Reassembly, and Reconstitution: Aquinas on the Soul." Die Menschliche Seele: Brauchen Wir Den Dualismus. Ed. B. Niederbacher and E. Runggaldier. Frankfurt, 2006. 151-72.
  • Vella, John. Aristotle: A Guide for the Perplexed. NY: Continuum, 2008.


  1. ^ Physics 194b23-24
  2. ^ Physics 195a16
  3. ^ Physics 194b9
  4. ^ Robinson 18-19
  5. ^ Physics 195a6-8
  6. ^ Metaphysics 1045a26-29
  7. ^ On the Soul 424a19
  8. ^ On the Soul 418a11–12
  9. ^ Categories 2a12-14
  10. ^ Cross 34
  11. ^ Kenny 24
  12. ^ Cross 94
  13. ^ Kenny 24
  14. ^ Leftow 136-37
  15. ^ Kenny 25
  16. ^ On the Soul 413a20-21
  17. ^ On the Soul 414a3-9
  18. ^ On the Soul 412a20, 414a15-18
  19. ^ On the Soul 412b5-7, 413a1-3, 414a15-18
  20. ^ 412b5-6
  21. ^ On the Soul 407b20-24, 414a22-24
  22. ^ Robinson 45-47
  23. ^ Robinson 46
  24. ^ Robinson 46
  25. ^ Robinson 47
  26. ^ Vella 92
  27. ^ Shields, Aristotle 290-93
  28. ^ Shields, Aristotle 291
  29. ^ On the Soul 412b19-24
  30. ^ 412b15
  31. ^ Shields, Aristotle 293
  32. ^ Shields, "A Fundamental Problem"
  33. ^ On the Soul 429a26-27
  34. ^ On the Soul 429a24-25
  35. ^ On the Soul 413b24-26, 429b6
  36. ^ On the Soul 15-25
  37. ^ Robinson 50
  38. ^ Caston, "Aristotle's Psychology" 337
  39. ^ Caston, "Aristotle's Psychology" 337
  40. ^ Shields, "Some Recent Approaches" 165
  41. ^ Pasnau 160
  42. ^ McEvilley 534
  43. ^ Vella 110
  44. ^ Caston, "Aristotle's Two Intellects" 207
  45. ^ Vella 110
  46. ^ Caston, "Aristotle's Psychology" 339
  47. ^ Caston, "Aristotle's Two Intellects" 199
  48. ^ Shields, "Soul as Subject"
  49. ^ Shields, "Soul as Subject" 142
  50. ^ Shields, "Soul as Subject" 145
  51. ^ Pessin, Sarah (April 18, 2014). "Solomon Ibn Gabirol [Avicebron]". In Zalta, Edward N. The Stanford Encyclopedia of Philosophy (Summer 2014 ed.). Retrieved October 13, 2015. 
  52. ^ Kenny 26
  53. ^ Cross 70
  54. ^ Stump, "Resurrection, Reassembly, and Reconstitution: Aquinas on the Soul" 161
  55. ^ Leftow, "Soul, Mind, and Brain" 397
  56. ^ Stump, "Resurrection, Reassembly, and Reconstitution: Aquinas on the Soul" 165
  57. ^ Eberl 340
  58. ^ Eberl 341
  59. ^ Stump, "Resurrection, Reassembly, and Reconstitution: Aquinas on the Soul" 161
  60. ^ Stump, "Non-Cartesian Substance Dualism and Materialism without Reductionism" 514
  61. ^ Stump,"Non-Cartesian Substance Dualism and Materialism without Reductionism" 512
  62. ^ Stump, "Non-Cartesian Substance Dualism and Materialism without Reductionism" 512
  63. ^ Stump, "Non-Cartesian Substance Dualism and Materialism without Reductionism" 519
  64. ^ Irwin 237
  65. ^ Metaphysics 1050a15
  66. ^ Irwin 237
  67. ^ Nichomachean Ethics 1098a16-18
  68. ^ Nichomachean Ethics 1098a1-5
  69. ^ Nichomachean Ethics 1098a7-8
  70. ^ Herbert, Nick (1985). Quantum Reality: Beyond the New Physics. New York: Anchor Books. pp. 26–27. 
  71. ^ Heisenberg, W. (1958). Physics and Philosophy. London: Allen and Unwin. p. 160. 


See also

In the experiments about atomic events we have to do with things and facts, with phenomena that are just as real as any phenomena in daily life. But atoms and the elementary particles themselves are not as real; they form a world of potentialities or possibilities rather than one of things or facts ... The probability wave ... mean[s] tendency for something. It's a quantitative version of the old concept of potentia from Aristotle's philosophy. It introduces something standing in the middle between the idea of an event and the actual event, a strange kind of physical reality just in the middle between possibility and reality.[71]

The idea of hylomorphism can be said to have been reintroduced to the world when Werner Heisenberg invented his duplex world of quantum mechanics.[70]

Modern physics

[69] Therefore, the best human life is a life lived rationally.[68] Aristotle bases his

slither. The more a thing achieves its potential, the more it succeeds in achieving its purpose. ought to Now, each thing has certain potentialities as a result of its form. Because of its form, a snake has the potential to slither. Hence, we can say that the snake [66] Aristotle holds a

Teleology and ethics

Aquinas believed that rational capacity was a property of the soul alone, not of any bodily organ.[61] However, he did believe that the brain had some basic cognitive function.[62] Aquinas’s attribution of rational capacity to the soul allowed him to claim that disembodied souls could retain their rational capacity, although he was adamant that such a state was unnatural.[63]

Eleanore Stump describes Aquinas's theory of the soul in terms of "configuration". The body is matter that is "configured", i.e. structured, while the soul is a "configured configurer". In other words, the soul is itself a configured thing, but it also configures the body.[60] A dead body is merely matter that was once configured by the soul. It does not possess the configuring capacity of a human being.

Thomas Aquinas claimed that X’s soul was X’s only substantial form, although X also had numerous accidental forms that accounted for X’s nonessential features.[54] Aquinas defined a substantial form as that which makes X's matter constitute X, which in the case of a human being is rational capacity.[55] He attributed all other features of a human being to accidental forms.[56] However, Aquinas did not claim that the soul was identical to the person.[57] He held that a proper human being is a composite of form and matter, specifically prime matter. Form and matter taken separately may retain some of the attributes of a human being but are nonetheless not identical to that person.[58] So a dead body is not actually or potentially a human being.[59]

Thomistic dualism

Many medieval theologians and philosophers followed Aristotle in seeing a living being's soul as that being's form—specifically, its substantial form. However, they disagreed about whether X's soul is X's only substantial form. Some medieval thinkers argued that X's soul is X's only substantial form, responsible for all of the features of X's body.[52] In contrast, other medieval thinkers argued that a living being contains at least two substantial forms—(1) the shape and structure of its body, and (2) its soul, which makes its body alive.[53]

Plurality vs. unity of substantial form

Medieval theologians, newly exposed to Aristotle's philosophy, applied hylomorphism to Christian doctrines such as the transubstantiation of the Eucharist's bread and wine into the body and blood of Jesus. Theologians such as Duns Scotus and Thomas Aquinas developed Christian applications of hylomorphism.

Medieval modifications

The Neoplatonic philosopher Avicebron (a.k.a.Solomon Ibn Gabirol) proposed a Neoplatonic version of this Aristotelian concept, according to which all things, including soul and intellect, are composed of matter and form.[51]

Universal hylomorphism

A third interpretation[48] relies on the theory that an individual form is capable of having properties of its own.[49] According to this interpretation, the soul is a property of the body, but the ability to think is a property of the soul itself, not of the body. If that is the case, then the soul is the body's form and yet thinking need not involve any bodily organ.[50]

Another interpretation rests on the distinction between the passive intellect and the agent intellect. According to this interpretation, the passive intellect is a property of the body, while the agent intellect is a substance distinct from the body.[42][43] Some proponents of this interpretation think that each person has his own agent intellect, which presumably separates from the body at death.[44][45] Others interpret the agent intellect as a single divine being, perhaps the Unmoved Mover, Aristotle's God.[46][47]

According to one interpretation, a person's ability to think (unlike his other psychological abilities) belongs to some incorporeal organ distinct from his body.[38] This would amount to a form of dualism.[39] However, according to some scholars, it would not be a full-fledged Cartesian dualism.[40] This interpretation creates what Robert Pasnau has called the "mind-soul problem": if the intellect belongs to an entity distinct from the body, and the soul is the form of the body, then how is the intellect part of the soul?[41]

Thus, interpreters of Aristotle have faced the problem of explaining how the intellect fits into Aristotle's hylomorphic theory of the soul. [37]" or "agent intellect".active intellect" and the "passive intellect These two intellectual powers are traditionally called the "[36] This seems to contradict Aristotle's claim that the soul is a form or property of the body. To complicate matters further, Aristotle distinguishes between two kinds of intellect or two parts of the intellect.[35] and suggests that it can exist apart from the body.[34] In fact, he says that it is not mixed with the body[33] Aristotle says that the intellect (


Another approach to resolving the problem[32] relies on a distinction between "proximate" and "non-proximate" matter. When Aristotle says that the body is matter for a living thing, he may be using the word "body" to refer to the matter that makes up the fully organized body, rather than the fully organized body itself. Unlike the fully organized body, this "body" remains the same thing even after death. In contrast, when he says that the body is no longer the same body after its death, he is using the word "body" to refer to the fully organized body, which (according to this interpretation) does not remain the same thing after death.

One approach to resolving this problem[31] relies on the fact that a living body is constantly losing old matter and gaining new matter. A five-year-old body consists of different matter than does the same person's seventy-year-old body. If the five-year-old body and the seventy-year-old body consist of different matter, then what makes them the same body? The answer is presumably the soul. Because the five-year-old body and the seventy-year-old body share a soul—that is, the person's life—we can identify them both as the body. Apart from the soul, we cannot identify what collection of matter is the body. Therefore, a person's body is no longer that person's body after it dies.

Some scholars have pointed out a problem facing Aristotle's theory of soul-body hylomorphism.[27] According to Aristotle, a living thing's matter is its body, which needs a soul in order to be alive. Similarly, a bronze sphere's matter is bronze, which needs roundness in order to be a sphere. Now, bronze remains the same bronze after ceasing to be a sphere. Therefore, it seems that a body should remain the same body after death.[28] However, Aristotle implies that a body is no longer the same body after death.[29] Moreover, Aristotle says that a body that has lost its soul is no longer potentially alive.[30] But if a living thing's matter is its body, then that body should be potentially alive by definition.

Living bodies

According to Timothy Robinson, it is unclear whether Aristotle identifies the soul with the body's structure.[22] According to one interpretation of Aristotle, a properly organized body is already alive simply by virtue of its structure.[23] However, according to another interpretation, the property of life—that is, the soul—is something in addition to the body's structure. Robinson uses the analogy of a car to explain this second interpretation. A running car is running not only because of its structure but also because of the activity in its engine.[24] Likewise, according to this second interpretation, a living body is alive not only because of its structure but also because of an additional property: the soul is this additional property, which a properly organized body needs in order to be alive.[25] John Vella uses Frankenstein's monster to illustrate the second interpretation:[26] the corpse lying on Frankenstein's table is already a fully organized human body, but it is not yet alive; when Frankenstein activates his machine, the corpse gains a new property, the property of life, which Aristotle would call the soul.

Hence, Aristotle argues, there is no problem in explaining the unity of body and soul, just as there is no problem in explaining the unity of wax and its shape.[20] Just as a wax object consists of wax with a certain shape, so a living organism consists of a body with the property of life, which is its soul. On the basis of his hylomorphic theory, Aristotle rejects the Pythagorean doctrine of reincarnation, ridiculing the notion that just any soul could inhabit just any body.[21]

Aristotle applies his theory of hylomorphism to living things. He defines a soul as that which makes a living thing alive.[16] Life is a property of living things, just as knowledge and health are.[17] Therefore, a soul is a form—that is, a specifying principle or cause—of a living thing.[18] Furthermore, Aristotle says that a soul is related to its body as form to matter.[19]

Basic theory

Body–soul hylomorphism

In some cases, a substance's matter will itself be a substance. If substance A is made out of substance B, then substance B is the matter of substance A. However, what is the matter of a substance that is not made out of any other substance? According to Aristotelians, such a substance has only "prime matter" as its matter. Prime matter is matter with no substantial form of its own.[14] Thus, it can change into various kinds of substances without remaining any kind of substance all the time.[15]

Medieval philosophers who used Aristotelian concepts frequently distinguished between substantial forms and accidental forms. A substance necessarily possesses at least one substantial form. It may also possess a variety of accidental forms. For Aristotle, a "substance" (ousia) is an individual thing—for example, an individual man or an individual horse.[9] The substantial form of substance S consists of S's essential properties,[10] the properties that S's matter needs in order to be the kind of substance that S is.[11] In contrast, S's accidental forms are S's non-essential properties,[12] properties that S can lose or gain without changing into a different kind of substance.[13]

Substantial form, accidental form, and prime matter

[8] such as colors, textures, and flavors, not just shapes.qualia Thus, forms include complex [7]

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