Metaphysics
Aristotle's mature ontology — fourteen books on being qua being, substance, and the unmoved mover
Tradition: Classical Greek philosophy / Aristotelianism
Being is said in many ways — substance is the focal sense — and the unmoved mover is the eternal actuality at the apex of nature
The Metaphysics is Aristotle's mature treatment of "first philosophy" — the study of being qua being. Its fourteen books (assembled posthumously into the order we have by the editor Andronicus, who reportedly placed them "after the physics," meta ta physika) develop the categories of substance, the doctrine of the four causes, the analysis of potentiality and actuality, and culminate in Book Lambda's theology of the unmoved mover — pure actuality thinking itself, the eternal source of motion at the apex of nature. The Metaphysics is the foundational text of Western philosophical metaphysics; Aquinas, Avicenna, and the entire scholastic tradition develop their first philosophy by extended commentary on it.
Author
Editions cited
- Aristotle: Metaphysics (Joe Sachs, Green Lion, 2nd ed. 2002)
- The Complete Works of Aristotle: Revised Oxford Translation (Jonathan Barnes, Princeton, 1984)
- Aristotle: Metaphysics Books Γ, Δ, and Ε (Christopher Kirwan, Oxford, 1971)
School Embodiments
The Metaphysics is the founding text of hylomorphism — the doctrine that every concrete substance is matter (hyle) informed by form (morphē). Aquinas takes this over directly.
"By form I mean the essence of each thing and its primary substance." (Metaphysics Z 7, 1032b)
Aristotle's mature realism — that there are mind-independent substances with intrinsic natures accessible to philosophical analysis — is the paradigm of Western philosophical realism.
"All men by nature desire to know." (Metaphysics A 1, opening sentence)
Aquinas's commentary on the Metaphysics is one of the principal medieval philosophical works; the Five Ways and the doctrine of God as ipsum esse subsistens are systematic developments of Metaphysics Lambda.
"On such a principle depends the heavens and the world of nature." (Metaphysics Λ 7, 1072b)
Avicenna's Shifā and Averroes's "long commentary" on the Metaphysics are the two greatest medieval philosophical engagements with Aristotle outside the Latin West. Falsafa makes the Metaphysics central.
"Thought thinking itself." (Metaphysics Λ 9, 1074b — the central description of the unmoved mover, preserved across the falsafa tradition)
Contemporary critical realism (Bhaskar, Lawson) traces its working metaphysics back to Aristotle's analysis of real structures and powers in nature.
"There are many senses in which a thing may be said to 'be'." (Metaphysics Γ 2, 1003a)
A more contested embodiment: Whitehead's process philosophy reverses Aristotle's priority of substance over process, but takes from him the analysis of actuality, potentiality, and final causation.
"What a thing is for the sake of which is its end." (Metaphysics Δ 4, 1014b — the doctrine of final causation)
Internal Tensions
The Metaphysics as we have it was not a single book composed by Aristotle; it is a posthumous compilation, and some books (K, especially) overlap with the Eudemian Ethics. The doctrine of the unmoved mover's relation to the world ("how can pure actuality move what it does not touch?") was the central medieval philosophical problem and remains a live point of dispute. Aristotle's treatment of the active intellect (in De Anima, but presupposed in the Metaphysics) supports both Avicennan-Thomistic personal-immortality readings and Averroist unicity-of-intellect readings.
I. Time
The cosmos is eternal — time has no beginning. Book Λ's unmoved mover is the eternal cause of the eternal circular motion of the outermost heaven, which communicates motion downward through nature. Time is substantival in the precise Aristotelian sense (the number of motion with respect to before and after, Physics IV.11), linear, uni-directional.
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II. Space
The Aristotelian cosmos is a finite, geocentric, hierarchically ordered sphere. Place (topos) is the inner boundary of the containing body. No vacuum, no infinite extension. Substantival in the sense that place is a real structural feature of nature.
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III. Matter
Prime matter (materia prima) is pure potentiality; every concrete substance is hylomorphic. Matter is substantival within the framework, conserved across substantial changes, locally interactive. The Metaphysics gives the most sustained ancient treatment of matter as a philosophical category.
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IV. Observer
The Aristotelian observer is embodied, plural, active. Knowledge is total in principle (the philosopher can know first causes) but built up through experience and demonstrative reasoning. The metaphysical agency is cosmic-ordering: the unmoved mover is "that for the sake of which" all natural motion is directed, but is not a personal providence. Moral authority is reason.
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V. Energy
Energeia — actuality — is one of Aristotle's technical achievements. The unmoved mover is pure actuality, eternal, complete. Created actualities are substantival within their finite lives and dissipative in the irreversible sense of natural change.
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VI. Information
The forms are the substantival informational structures of things — eternal patterns realised in matter. The forms are conserved at the cosmic scale; individual substantial forms cease at the end of each particular's existence. Personal immortality is famously unsettled in Aristotle: De Anima III.5 leaves the question of the active intellect's persistence open in a way that Avicenna, Aquinas, and Averroes each resolved differently.
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How Metaphysics resolves each dilemma
51 resolved positions across 4 dimensions · 6 unaligned.
Each dimension is sorted so minority positions come first. Mainstream positions are folded into an expandable list.