Prime Matter — the prima materia of alchemical tradition, the arche of Greek philosophy, the formless receptacle of Platonic cosmology — occupies a pivotal position in depth-psychological writing as the foundational substrate from which transformation becomes possible. The corpus reveals a rich convergence of ancient and modern registers. Plato's Timaeus establishes the archetype: a receiving principle that must be utterly formless to accept every variety of impressed form, likened to a mother, indifferent and inodorous, prior to all determination. Plotinus carries this further, distinguishing the Primal Matter of the Intelligible realm from compound destructible things, insisting that matter as such remains indeterminate, apprehended only by 'spurious reasoning.' The Stoics, as transmitted by Sedley, identify prime matter with the universal passive substance — the substrate through which active Reason or logos passes like seed. In depth psychology proper, Edinger maps arche directly onto alchemical prima materia, reading it as the psyche's own primordial, undifferentiated condition — the raw material requiring the individuation process. Giegerich presses the concept further, treating the prime matter's intrinsic 'reddening' and 'corruption ever deeper into itself' as a figure for the soul's movement through negation. The governing tension across all voices is between matter as passive recipient and matter as latently active, between formlessness as deficiency and formlessness as creative potential.
if the matter were like any of the supervening forms, then whenever any opposite or entirely different nature was stamped upon its surface, it would take the impression badly, because it would intrude its own shape. Wherefore, that which is to receive all forms should have no form
Plato establishes prime matter as the absolutely formless receptacle — a condition of radical indeterminacy required precisely so that it may receive every form without prejudice.
, Timaeus, -360thesis
The basic-constituents of things must be either their Form-Idea or that Primal Matter [of the Intelligible] or a compound of the Form and Matter. Form-Idea, pure and simple, they cannot be: for without Matter how could things stand in their mass and magnitude? Neither can they be that Primal Matter, for they are not indestructible.
Plotinus argues that sensible things are neither pure Form-Idea nor Primal Matter alone but composites, distinguishing a higher Primal Matter of the Intelligible from the indeterminate base of the physical world.
, The Six Enneads, 270thesis
it is the prime matter of all bodies, and through it, they say, complete and universal reason passes, just like seed through the genital organs. This reason they take to be an actual craftsman, while the cohering body they take to be without quality, i.e. matter or substance, completely passive and subject to change.
The Stoic tradition identifies prime matter as the universal passive substrate — utterly without quality — through which active rational principle operates as generative craftsman.
, The Hellenistic Philosophers, 1987thesis
The other fundamental concept of the Milesians is the term arche. It means beginning; principle; original substance; in German, urstoff, ruling element. In alchemy the term arche was translated as prima materia or first matter.
Edinger directly equates the Milesian philosophical concept of arche with the alchemical prima materia, grounding depth psychology's use of the term in the earliest Greek cosmological thinking.
, The Psyche in Antiquity, Book One Early Greek Philosophy thesis
the indeterminate has some footing in the sphere of affirmation. The eye is aware of darkness as a base capable of receiving any colour not yet seen against it: so the Mind, putting aside all attributes perceptible to sense, comes upon a residuum which it cannot bring under determination
Plotinus describes the mind's encounter with prime matter as an experience of formless darkness — a residuum beyond determination that paradoxically sustains a minimal mode of presence.
, The Six Enneads, 270thesis
is the literal shift of focus away from the individual to the 'cosmos' really the same thing as the prime matter's intrinsic 'reddening to the world out there'?
Giegerich interrogates whether Hillman's outward turn literalizes what alchemy intended as the prime matter's internal dialectical movement — the intrinsic reddening — rather than a spatial reorientation.
, The Soul’s Logical Life Towards a Rigorous Notion of, 2020thesis
prima materia, prime matter 62-64, 71, 76, 134, 139, 188, 193, 194, 198, 212 corruption ever deeper into itself 195
Giegerich's index entry clusters prime matter with the motif of self-deepening corruption, signaling its role as the site of soul's most radical self-negation within the alchemical opus.
, The Soul’s Logical Life Towards a Rigorous Notion of, 2020supporting
The imagination could never imagine 'matter.' This is far too abstract, far too amorphous a concept. 'Matter' is not an empirical, visible fact. It is already a thought, an abstraction. It is sublated things.
Giegerich argues that 'matter' — including prime matter — is not an imaginal but a logical concept, belonging to alchemy's transition from the plane of formed images to dialectical, microphysical thought.
, The Soul’s Logical Life Towards a Rigorous Notion of, 2020supporting
Matter is continuously overruled towards the better; so that out of the total of things — modified by Soul on the one hand and by Matter on the other hand — there is, in the end, a Unity.
Plotinus frames prime matter not as mere passive negativity but as a pole of a dynamic tension with Soul, the resolution of which produces cosmic unity.
, The Six Enneads, 270supporting
we must consider the nature of fire, and water, and air, and earth, such as they were prior to the creation of the heaven, and what was happening to them in this previous state; for no one has as yet explained the manner of their generation
Plato identifies the pre-cosmic state of the elements as a domain of unresolved prior conditions — the precursor problem that drives his inquiry into formless, receptive matter.
, Timaeus, -360supporting
How can matter be conceived to exist without form? Or, how can the essences or forms of things be distinguished from the eternal ideas, or essence itself from the soul?
The Timaeus commentary surfaces the philosophical aporia at the heart of prime matter's conceptual status — matter without form remains strictly inconceivable, a limit-question for Platonic cosmology.
, Timaeus, -360aside
Prime Cause, 14 primitive man, 115, 333 psychology of, 33, 278
Jung's index to Psychology and Alchemy places prime matter in close proximity to the prima materia's thousand names and its identification with the unconscious, marking its structural centrality to the alchemical-psychological mapping.
, Psychology and Alchemy, 1944aside