De Anima
On the Soul — Aristotle's treatise on the soul in three books
Tradition: Classical Greek philosophy / Aristotelianism
The soul is the form of the living body — and the active intellect is the puzzle that defined medieval philosophy
De Anima is Aristotle's mature philosophy of mind and life. The soul is defined as "the first actuality of a natural body that has life potentially" (II.1, 412a27) — the substantial form that makes a living body what it is. Across three books Aristotle analyses the nutritive, sensitive, and rational capacities of soul; the special and common sensibles; the role of phantasia (imagination); and — in the famously short and disputed III.5 — the "active intellect" (nous poiētikos) that "comes from outside" and is "alone immortal and eternal." The text is the foundation of Aristotelian philosophy of mind, Aquinas's hylomorphic anthropology, the Averroist tradition's unicity of intellect, and the modern philosophical engagement with embodied cognition.
Author
Editions cited
- Aristotle: De Anima (Christopher Shields, Oxford, 2016 — with commentary)
- Aristotle: De Anima (Mark Shiffman, Focus, 2011)
- The Complete Works of Aristotle (Jonathan Barnes, Princeton, 1984)
School Embodiments
De Anima is the founding text of hylomorphic philosophy of mind — the soul as the substantial form of the living body. Every later Aristotelian philosophy of mind takes its categories from here.
"The soul is the first actuality of a natural body having life potentially." (De Anima II.1, 412a27)
Aquinas's commentary on De Anima and the corresponding sections of the Summa (especially Prima Pars q.75–89) are the central medieval engagement with the text. The hylomorphic doctrine of the soul is taken over directly.
"If, then, there is any of the soul's functions that belongs to it without a body, it would be possible for the soul to be separated." (De Anima I.1, 403a10)
Avicenna and Averroes both wrote major commentaries on De Anima. The Averroist doctrine of the unicity of the active intellect — that there is one intellect for all humans — is the central controversy of medieval Latin Averroism (condemned at Paris 1277).
"This intellect is separable, impassible, and unmixed... in its essence activity." (De Anima III.5, 430a17)
De Anima's working realism — that the soul is a real feature of living bodies, that sensation receives the forms of sensible objects, that intellect grasps real universals — is foundational for the Western realist tradition.
"The soul is in a sense all existing things." (De Anima III.8, 431b21)
Modern panpsychists read Aristotle's graduated doctrine of soul — plants have nutritive soul, animals add sensitive, humans rational — as a precursor of the panpsychist intuition that mind goes "all the way down" in graded form.
"The nutritive soul... is found in plants." (De Anima II.3, 414a32)
Heidegger's lectures on Aristotle (1921–22, 1924) and Merleau-Ponty's phenomenology of perception both engage De Anima as a precursor to embodied-cognitive phenomenology.
"Sensation is a kind of being-acted-upon." (De Anima II.5, 416b34)
Internal Tensions
De Anima III.5 — a single short chapter on the active intellect — is one of the most disputed pieces of philosophical text ever written. Avicenna read it as support for personal immortality (with the active intellect as a separate substance into which individual intellects are received); Averroes read it as the unicity of intellect (one shared intellect for all humans, denying personal immortality); Aquinas held a position closer to Avicenna but with a robust personal-soul theology added. The text's brevity and ambiguity sustain all three readings.
I. Time
Soul is the actuality of a living body in time. The active intellect is described as "eternal," but Aristotle is famously reticent about what survives the composite human person. Within embodied life, time is linear, the medium of growth and decline.
Attributes
II. Space
Standard Aristotelian cosmology. The soul is "in" the body in the sense of being its form, not in any spatial container sense.
Attributes
III. Matter
Hylomorphic: matter is the substrate, soul is the form. The living body is a hylomorphic composite, not a Cartesian-style two-substance affair. Aristotle's famous example: the soul stands to the body as sight stands to the eye (II.1, 412b18) — they are not two things but one composite under two descriptions.
Attributes
IV. Observer
The Aristotelian observer is the embodied living being, with a graduated soul (nutritive in plants, sensitive in animals, rational in humans). Knowledge is built up through sensation, phantasia, and intellect. Active in cognitive engagement with the world. The metaphysical agency is cosmic-ordering — the Unmoved Mover is the final cause of all natural motion, including cognition.
Attributes
V. Energy
Energeia — actuality — is Aristotle's technical term, and De Anima is one of the texts in which it does the most work. The soul is the first actuality of the living body; cognition is a second actuality. Substantival, conserved across activities, irreversibly dissipative within the finite life.
Attributes
VI. Information
The forms of sensible objects are received into the sense organs; the forms of intelligibles are received by the intellect. Forms are substantival informational structures, conserved at the cosmic scale. Personal information is famously unsettled in De Anima — the active intellect "alone is immortal and eternal" (430a23), but whether what survives is the individual or a shared intellect was the great medieval dispute.
Attributes
Personas that cite this work
Personas with the nearest attribute fingerprint
Historical figures whose own classification on the same six-dimensional grid lands closest to this work's. Computed by attribute-agreement on coordinates both address.
Computed school proximity
The work's attribute fingerprint scored against all schools using the same quiz scorer. Useful as a sanity check on the hand-curated embodiments above.
How De Anima 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.