Within the depth-psychology corpus and its adjacent philosophical, theological, and gnostic sources, 'The One' functions as a supreme organizing concept that resists definition precisely because it transcends all categories of predication. The term operates across at least four distinct registers. In the Gnostic material assembled by Meyer, The One designates the invisible, illimitable, primordial spirit from which all reality emanates — an apophatic absolute that cannot be named, measured, or perceived, existing beyond all god-language. In the Platonic tradition, most fully elaborated in the Parmenides, The One becomes the pivot of a rigorous logical investigation into the conditions of unity, being, and number, generating paradoxes that anticipate Neoplatonic emanationist metaphysics. In the Trinitarian theology of John of Damascus and the Hilarian corpus, oneness functions christologically: the claim that Father and Son are One refutes both polytheism and unitarianism, insisting that unity of essence does not imply singleness of person. In Vedantic philosophy as presented by Zimmer, The One corresponds to Atman-Brahman identity — 'that art thou' — where all multiplicity resolves into a single, all-pervading essence. Across these traditions the shared tension is between an apophatic, wholly transcendent One and an immanent One that constitutes the ground of differentiated experience. Depth psychology inherits this tension wherever it theorizes the Self, the unus mundus, or the archetype of wholeness.
In the library
19 substantive passages
The One is a sovereign that has nothing over it. It is God and parent, father of all, the invisible one that is over all, that is incorruptible, that is pure light at which no eye can gaze.
This passage presents the most systematic apophatic theology of The One in the corpus, articulating it as illimitable, immeasurable, unutterable, and ontologically prior to all existing things.
Marvin W. Meyer, The Gnostic Gospels of Jesus: The Definitive Collection of Mystical Gospels and Secret Books about Jesus of Nazareth, 2005thesis
The One is not corporeal and it is not incorporeal. The One is not large and it is not small. It is impossible to say, How much is it? What [kind is it]? For no one can understand it.
This passage demonstrates that Gnostic negative theology defines The One by systematically negating every attribute, making comprehension structurally impossible.
Marvin W. Meyer, The Gnostic Gospels of Jesus: The Definitive Collection of Mystical Gospels and Secret Books about Jesus of Nazareth, 2005thesis
In the one of being or the being of one are two parts, being and one, which form one whole. And each of the two parts is also a whole, and involves the other… and thus one is never one, and in this way the one, if it is, becomes many and infinite.
Plato's Parmenides exposes the foundational paradox: any attempt to predicate being of The One immediately multiplies it, so that strict unity cannot coexist with existence.
If the argument is to be trusted, the one neither is nor is one… But that which is not admits of no attribute or relation. Then there is no name, nor expression, nor perception, nor opinion, nor knowledge of it.
Plato pursues The One to its logical limit and finds that absolute oneness, stripped of all temporal and relational predicates, is indistinguishable from absolute non-being.
We may now endeavour to thread the mazes of the labyrinth which Parmenides knew so well, and trembled at the thought of them.
The editorial framing of the Parmenides situates the investigation of The One as a philosophically vertiginous exercise whose conclusions cannot be comfortably assigned to scepticism, Heracliteanism, or simple Platonic idealism.
Parmenides' fundamental claim… is that what is is fully… By treating what is (to eon, Being) as substance… retains monism… it produces its strange conclusions.
Seaford contextualises Parmenidean monism as a response to earlier cosmological pluralism, showing that The One as Being emerges from a specific philosophical polemic about underlying substance.
Seaford, Richard, Money and the Early Greek Mind: Homer, Philosophy, Tragedy, 2004supporting
In the passage from one to many and from many to one, the one is neither one nor many, neither separated nor aggregated.
This passage details the transitional or liminal status of The One: in every passage between states it eludes all positive characterisation, occupying a threshold beyond predication.
If they had no parts they would be simply one, and parts imply a whole to which they belong.
Plato's analysis of parthood establishes that The One is the necessary presupposition of all plurality, since parts are intelligible only in relation to the whole they constitute.
They Who are one in essence are not one person, and He Who is not one person with Him Who is, is yet so free from difference from Him that They Two are One God.
Hilary's Trinitarian argument deploys the concept of The One to navigate between numerical singularity and personal distinction, making unity of essence the criterion of divine identity.
John of Damascus, Saint John of Damascus Collection, 2016thesis
When we confess that God is One we deny that He is single; for the Son is the complement of the Father, and to the Father the Son's existence is due.
This passage insists that confessing divine oneness is not equivalent to affirming divine solitude, using The One as a relational rather than isolating concept.
John of Damascus, Saint John of Damascus Collection, 2016supporting
If thou wrongly employest the confession of one God to deny the Godhead of Christ, on the ground that where one God exists He must be regarded as solitary, and that to be One is characteristic and peculiar to Him Who is One.
The passage identifies the central theological danger of The One: that numerical oneness, misapplied, collapses the Trinity into a solitary monad and excludes Christological claims.
John of Damascus, Saint John of Damascus Collection, 2016supporting
Our Lord prays to His Father that those who shall believe in Him may be one, and as He is in the Father and the Father in Him, so all may be one in Them.
The Johannine prayer for unity is interpreted as a claim about ontological participation in the divine One, not merely moral or volitional agreement.
John of Damascus, Saint John of Damascus Collection, 2016supporting
'That art thou' (tat tvam asi), this word of the old Brāhman Āruṇi to his son… reduced the entire spectacle of nature to its single, all-pervading, most subtle, absolutely intangible, hidden essence.
Zimmer presents the Vedantic mahāvākya as the Indian equivalent of The One doctrine: individual selfhood and cosmic ground are identical, and multiplicity is a surface over a single hidden essence.
Zimmer, Heinrich, Philosophies of India, 1951thesis
He does not belong to the class of existing things: not that He has no existence, but that He is above all existing things, nay even above existence itself.
John of Damascus articulates the same apophatic structure as the Gnostic One: the divine principle transcends the category of being entirely, making all positive predication inadequate.
John of Damascus, An Exact Exposition of the Orthodox Faith, 2021supporting
We shall speak of things which they preached in a mystery; of Thee, O God Eternal, Father of the Eternal and Only-begotten God, Who alone art without birth… We may not sever Him from Thee, or make Him one of a plurality of Gods.
Hilary frames the theological project as the defense of a singular divine source (The One without birth) against both fragmentation into polytheism and reduction to bare monotheistic singleness.
John of Damascus, Saint John of Damascus Collection, 2016supporting
The not-one cannot partake of the one; otherwise it would not have been not-one, but would have been in some way one.
The logical analysis of the not-one clarifies The One's exclusivity: nothing can partially share in The One without thereby ceasing to be its opposite, reinforcing the absolute character of unity.
These three are One, [which the Philosopher would have to be] body, spirit, and soul, for all perfection consisteth in the number three.
The alchemical-Trinitarian formula equates The One with the triadic unity of body, spirit, and soul, locating the concept within the hermetic tradition of totality-through-threefold-structure.
von Franz, Marie-Louise, Aurora Consurgens: A Document Attributed to Thomas Aquinas on the Problem of Opposites in Alchemy, 1966aside