Aristotle’s Hylomorphism, Energeia, and the Unmoved Mover: Third Lecture on Western Philosophy for Indian Students

Aristotle’s Hylomorphism, Energeia, and the Unmoved Mover (full technical apparatus: hypokeimenon, to ti ên einai, synderesis, prohairesis, etc.)

Third Lecture

by Tanmoy Bhattacharyya

If Plato performed the great χωρισμός (separation) of true being from the sensible world, Aristotle (384–322 BCE) performed the equally monumental συγκατάθεσις (reconciliation). He did not simply return to pre-Socratic naturalism; he absorbed the Parmenidean and Platonic demand that being be intelligible, then showed that the sensible particular — this horse, this bronze sphere — is ontologically prior to every supposedly separate Form. The result is the most technically dense and lexically ferocious philosophical system ever built in Greek.

This lecture descends into the full Aristotelian apparatus at graduate level: synolon and to ti ēn einai, the four aitia, energeia/dunamis/entelecheia, the critique of methexis, the pros hen equivocity of being, the categories, nous pathetikos/noêtikos/poêtikos, the prime mover as noesis noeseôs, and the esoteric fragments on the aether and the soul’s separability. Every rare and exact term is used in its strict Aristotelian sense: hypokeimenon, ousia prote, tode ti, katholou, sterêsis, pathos, hexis, diathesis, prohairesis, synderesis, mesotês, epagogê, nous as hexis, etc.

1. The Rejection of Platonic Chorismos

Aristotle’s critique of the Theory of Forms is merciless and permanent (Metaphysics A 9, M 4–5, N 1–3; Posterior Analytics I 11):

1. Separate Forms cannot explain change or movement (τὸ κινοῦν αἴτιον).
2. The “third man” regress shows that positing a separate paradigm generates infinite duplication.
3. Forms are epistemologically idle: we know particulars, not abstracta.
4. Participation (methexis) is metaphorical gibberish (κενῶς λέγεσθαι).

Instead, Aristotle offers the single most important sentence in the history of ontology (Metaphysics Z 3, 1029a27–28):

τὸ δὲ κυριώτατον ὄν ἐστιν ἡ οὐσία (“The most authoritative sense of being is substance.”)

Substance (ousia) is not a genus; it is the concrete individual that exists πρωτίστως καὶ μάλιστα (“first and most of all”). The primary instance of being is τὸ σύνολων (synolon) — the hylomorphic compound of matter (hylê) and form (morphê/eidos).

2. Hylomorphism: The Synolon and the To Ti Ên Einai

Every natural substance is a συνάμφω (synamphô, “both-together”) of:

• ὕλη (hylê) – determinate potentiality, the subject of change
• εἶδος / μορφή (eidos/morphê) – the intrinsic actuality that makes the thing what it is

Crucially, the eidos is not a Platonic separate entity; it is immanent and identical with the τὸ τί ἦν εἶναι (to ti ēn einai) — the “what-it-was-to-be-that-thing,” the quiddity or essence. In the case of living beings, the soul (psychê) is nothing other than the first entelecheia of a natural body having life in potentiality (De Anima B 1).

This essence is not a universal predicate but the concrete formal cause that actualizes the matter. A human being is not “matter participating in the separate Form Man”; it is this flesh-and-bone synolon whose form is rational animality.

3. The Four Causes (τὰ τέσσερα αἴτια)

Physics B 3 and Metaphysics A 3–10:

1. τὸ τί ἦν εἶναι (formal cause)
2. τὸ ἐξ οὗ (material cause)
3. τὸ ὅθεν ἡ ἀρχὴ τῆς κινήσεως (efficient/moving cause)
4. τὸ οὗ ἕνεκα (final cause)

All four are simultaneous in natural substances. Teleology is not an optional extra; it is the presence of the formal cause as the intrinsic orientation of the process. The acorn becomes the oak because its form is already operative as entelechy.

4. Dunamis and Energeia: The Core of Aristotelian Ontology

Aristotle’s greatest conceptual invention (Metaphysics Θ):

• δύναμις (dunamis) – potency, capacity, the “from-which” of change
• ἐνέργεια (energeia) – actuality, activity, being-at-work
• ἐντελέχεια (entelecheia) – having-its-end-within, complete actuality

Crucial distinctions:

• κίνησις (kinêsis) – incomplete actuality (building a house)
• ἐνέργεια ἀτελής vs ἐνέργεια τελεία – imperfect vs perfect activity (seeing, thinking)

The priority of energeia is absolute:

• Ontological: actuality is prior in ousia (Θ 8, 1049b5)
• Temporal: the actual chicken precedes the potential chicken in the chain
• Epistemological: we define the potential through the actual

5. The Categories and the Pros Hen Equivocity of Being

Being is not a genus (Post. Anal. B 7; Metaph. B 3). Instead, it is said πρὸς ἕν (pros hen, “with reference to one”) — focal meaning:

• οὐσία (substance) – primary
• ποιότης, ποσότης, πρός τι, ποῦ, πότε, κεῖσθαι, ἔχειν, ποιεῖν, πάσχειν – the nine accidents

Every category is intelligible only by reference to substance. A quality is the quality of a substance; a relation is the relation of a substance.

6. The Science of Being qua Being and Theology

Metaphysics Γ–Ε establishes ontology as a science. Book Λ then reveals that the science culminates in θεολογική (theological science), because the first principle of all reality is an οὐσία ἀΐδιος καὶ ἀκίνητος καὶ χωριστή (eternal, unmoved, separate substance).

The Prime Mover (Λ 7–10):

• Pure ἐνέργεια νοήσεως (actuality of thinking)
• Νόησις νοήσεως (thinking of thinking)
• Separated from magnitude, impassive, unchangeable
• Moves the heavens as ὄρεξις καὶ νοῦς (object of desire and object of intellect)

The famous phrase ζωὴ αἰώνιος (eternal life) and the description of divine self-contemplation as ἡδονὴ ἀκήρατος (unmixed pleasure) show that Aristotle’s God is not a cold abstraction but the absolute plenitude of noetic energeia.

7. Psychology: The Soul as Entelecheia and the Enigma of Nous Poêtikos

De Anima Γ 4–5 contains Aristotle’s most difficult doctrine:

• Soul is the first entelecheia of a natural instrumental body
• Sensation is the reception of form without matter (ἄνευ τῆς ὕλης)
• Nous has two aspects: a) νοῦς παθητικός (passive intellect) – becomes all things b) νοῦς ποιητικός (active intellect) – makes all things, χωριστὸς καὶ ἀπαθὴς καὶ ἀμιγής (separate, impassive, unmixed)

The active intellect is immortal and divine; the passive perishes. This is Aristotle’s own χωρισμός — not of Platonic Forms, but of the highest part of human intellect.

8. Ethics and the Prohairetic Life

Nicomachean Ethics introduces:

• προαίρεσις (prohairesis) – deliberate choice, the core of moral personality
• ἕξις (hexis) – stable disposition
• μεσότης (mesotês) – the mean relative to us
• φρόνησις (phronêsis) – practical wisdom, the intellectual virtue that actualizes prohairesis

The human telos is ἐνέργεια κατὰ τὴν κρατίστην ἕξιν — activity in accordance with the best disposition, which for man is θεωρία (contemplation) of the highest objects.

9. Esoteric Fragments: Aether and Contemplative Death

In the lost dialogue On Philosophy and in De Caelo, Aristotle posits a fifth element (τὸ πέμπτον στοιχεῖον), the αἰθήρ — divine, circular-moving, neither heavy nor light. The heavens are alive with noetic circular motion.

The Eudemus fragment famously declares that, when we die, we awaken from the dream of life and remember true reality — a startlingly Platonic moment in Aristotle’s esoteric teaching.

Key Technical Vocabulary (strict Aristotelian usage)

• σύνolon – hylomorphic compound
• τὸ τί ἦν εἶναι – the what-it-was-to-be-that-thing (quiddity)
• οὐσία πρώτη / δευτέρα – primary / secondary substance
• ὕλη πρώτη / δευτέρα – first / second matter
• στέρησις – privation (third principle of change)
• ἐντελέχεια – complete actuality
• ἐνέργεια / κίνησις – activity / motion
• πρός ἕν / πρὸς ἕν λέγεσθαι – focal meaning
• κατηγορίαι – the ten categories
• νοῦς ποιητικός – agent intellect
• νοῦς παθητικός – possible intellect
• προαίρεσις – deliberate choice
• ἕξις / διάθεσις / πάθος – disposition / state / passion
• μεσότης ἀρετή – doctrine of the mean
• φρόνησις / σοφία / ἐπιστήμη / τέχνη / νοῦς – the five intellectual virtues
• θεωρία – contemplation (highest human activity)
• ὄρεξις νοητή – intelligible object of desire
• νόησις νοήσεως – thinking of thinking

Study Questions (very advanced)

1. Why does Aristotle claim that the formal and final causes coincide in natural substances, but not in artifacts?
2. Explain the exact sense in which energeia is prior “in ousia” to dunamis (Θ 8). Why is this the death-blow to Platonism?
3. Reconstruct the argument in Metaphysics Z 17 that form is substance more than the synolon or matter.
4. Why does the prime mover move without being moved? Show how this requires it to be pure noesis and not practical intellect.
5. Using only De Anima Γ 5, argue whether nous poêtikos is part of the individual human soul or a single trans-personal intellect. (The tradition is divided.)

In our next Fourth Lecture, we will enter the medieval synthesis: Augustine’s illuminatio, Aquinas’ esse/essentia distinction, analogia entis, Duns Scotus’ haecceitas and univocity, Ockham’s razor, and the disintegration of Aristotelian realism into nominalism.