De divisione naturae (Periphyseon)
_De divisione naturae_, whose catalogued title is _De divisione naturae libri quinque_, is a Latin philosophical and theological dialogue in five books, also known as the _Periphyseon_ (“On Nature”). It is not a narrative work or a biography but a sustained speculative inquiry into the whole of reality. The interlocutors are a teacher, often called _Nutritor_, and a student, _Alumnus_. The student’s questions elicit a dialectical exposition in which distinctions are proposed, objections raised, and conclusions tested by syllogistic reasoning. The aim is not merely to classify things but to understand “nature” as one ordered whole, including both God and creation.
The Fourfold Division of Nature
The organizing scheme of the work is the division of nature into four species:
- Nature that creates and is not created — God considered as the source and principle of all things.
- Nature that is created and creates — the realm of primordial causes or ideas, closely associated with the Word/Son; these causes are established by God and themselves bring forth created effects.
- Nature that is created and does not create — the visible, contingent, sense-perceived world of generated things.
- Nature that neither creates nor is created — God considered as the end or term to which all things return.
The first and fourth species are both God, but under different aspects: as origin and as end. The second and third are created, but the second is active and causal while the third is passive and caused. The scheme is therefore not a static list of four separate realities. It is at once a logical classification and a cosmological pattern of procession from God, creation through causes, the manifestation of the sensible world, and return to God.
Being, Non-Being, and the Limits of Language
Eriugena treats “nature” as the comprehensive name for all things that are and all things that are not. This leads to an extended inquiry into the different senses of being and non-being: things accessible to sense or intellect versus privations, higher causes versus lower effects, actual versus possible realities, and so on. God is described as beyond both being and non-being, not one being alongside others. The ten categories of Aristotelian logic are held not to apply to God, and negative theology is given priority over affirmative theology. Language about God is necessarily metaphorical and derived from created things; creatures themselves are understood as manifestations or theophanies of the divine.
Creation “from nothing” is interpreted in light of God’s transcendence rather than as the shaping of preexistent matter. The Word is presented as the divine self-expression in which the primordial causes of all things are established. The created order is not a second god but a manifestation of the one divine principle, and the return of all things is framed as the consummation of that manifestation.
Book I
Book I lays out the program. It defines nature, introduces the fourfold division, and begins with the first species: God as that which creates and is not created. Much of the book concerns how God can be spoken of at all. Eriugena argues that God is beyond being and non-being, that the categories of logic do not apply to God, and that affirmative theology must be balanced by negative theology. Creation “from nothing” is interpreted in relation to God’s transcendence, and the Word is presented as the principle in which the causes of things are established. The book also introduces the primordial causes, which dominate the next stage of the dialogue.
Book II
Book II turns to the second species, the nature that is created and creates. These are the primordial causes or ideas, understood as the eternal reasons of things established in the Word/Son. The book explores how the Trinity is involved in the causal order, how the causes are both created and creative, and how the visible world proceeds from them. It insists that the created order is not independent of God but a manifestation of the one divine principle. The discussion moves from the causal order toward the world of effects.
Book III
Book III treats the third species, the nature that is created and does not create: the visible, corporeal, temporal world. It follows the Genesis account of creation, interpreting the six days, the formation of the cosmos, and the creation of human beings. Matter, form, time, and place are discussed as conditions of the sensible world. The visible world is understood as an effect and image of the intelligible causes, a theophany in which divine goodness is manifested. The book also addresses paradise, the human condition, and the fall, setting up the problem of return.
Book IV
Book IV continues the analysis of the created order, with particular attention to human nature. It considers the soul and body, the consequences of sin, and the way human beings are implicated in the world’s estrangement from God. It begins to articulate how the return is possible: through Christ, through the restoration of human nature, and through the transformation of the sensible into the intelligible. The book is transitional, completing the account of creation and preparing the final treatment of return.
Book V
Book V turns to the fourth species, the nature that neither creates nor is created: God as the end to which all things return. It describes the consummation of the created order, the resurrection, the spiritual body, and the deification of human nature. The return is not a movement in space but the resolution of multiplicity into unity in God. The dialogue presents God as both beginning and end, the source from which nature proceeds and the term in which it rests. The work closes with the vision of all things returning to their principle.
Method and Themes
The work is argumentative rather than narrative. It proceeds by dialogue, distinction, and syllogism, and it gives reason a strong role while seeking agreement with authoritative Christian teaching. Its intellectual sources include Greek Christian Platonism, especially Pseudo-Dionysius and Maximus Confessor, as well as Augustine. Its central themes are the transcendence of God, creation as theophany, the primordial causes, the nature and fall of humanity, and the return of all things to God. The result is a comprehensive speculative account of nature as a dynamic whole, from God through creation to God.
Dialectic and the Meaning of “Nature”
The fourfold division is not merely a classification imposed on reality; it is the book’s way of tracing the movement of all things from unity to multiplicity and back. “Nature” is treated as a comprehensive term that can include God without making God one being among others. The work therefore combines affirmative discourse—what can be said of God as cause, wisdom, life, and being—with negative discourse that denies every predicate as inadequate to the divine superessentiality. In this scheme God is “nothing” not by defect but by excess: beyond being, beyond knowing, beyond naming. Created things, by contrast, have being only as participated and manifested. This dialectic of affirmation and negation governs the book’s treatment of creation, Scripture, and the return of all things.
Creation, Symbol, and Theophany
The book develops creation as a self-manifestation of the hidden God. The visible world is not a second reality alongside God but a symbol and effect of the intelligible causes; each creature is in some measure a theophany, a showing-forth of divine goodness. The account avoids a simple pantheistic identity: the created order proceeds from God and manifests God, yet God remains transcendent and uncontained. The primordial causes in the Word are the mediating order through which the one divine principle becomes many without losing unity. Scripture and the Genesis narrative are read in this speculative light, with the literal sense opened toward intelligible and theological meaning. This is why the book can treat the visible cosmos as both real and symbolic: its reality is received, and its meaning is its relation to its cause.
Human Nature, Sin, and Restoration
The account of human nature is central to the whole: the human being is made in the image of God and is understood as a kind of bond or microcosm in which intelligible and sensible creation meet. The fall introduces estrangement, division, and subjection to the conditions of the sensible world, but it does not cancel the image. The return is therefore worked out as restoration of human nature in Christ and as the gradual transformation of the sensible into the intelligible. The treatment of resurrection and spiritual body belongs to this same movement: not escape from creation but its transfiguration and reintegration. The return is universal in scope because the whole created order shares in the movement back to its principle.
Negative Theology and the End of Nature
The final book’s account of God as end is inseparable from its negative theology. God is beginning, middle, and end; creation goes forth from God and returns to God, and in the consummation multiplicity is resolved into unity. This unity is not the abolition of created reality into a material continuum but the gathering of all things into their eternal reasons and, beyond them, into the superessential source. The book’s significance lies in the way it holds together a Christian doctrine of creation with a Neoplatonic pattern of procession and return, and in the seriousness with which it pursues reason’s quest for a single account of nature. It is speculative and systematic, but its aim is worshipful understanding: the whole of nature is seen as a dynamic order whose ground and goal is the ineffable God.
