The Principium Individuationis occupies a structurally foundational position in the depth-psychological corpus, functioning simultaneously as an ontological principle, a cosmological drama, and a clinical imperative. Jung's earliest and most compressed formulation appears in the Septem Sermones ad Mortuos, where the term names the creature's essential drive toward distinctiveness against the undifferentiated nothingness of the Pleroma — dissolution into which constitutes literal psychic death. This Gnostic framing, preserved verbatim in Memories, Dreams, Reflections and echoed by Edinger, establishes the term's double valence: individuation is simultaneously the creature's highest calling and its most perilous adventure, since the intensification of individual selfhood concentrates — and therefore mirrors — the infinite Pleromatic fullness. Jung's alchemical writings extend this into the mercurial spirit motif, where the principium individuationis becomes a force that can be wrongly imprisoned by spiritual authority, linking the concept to Schopenhauer's and Buddhism's ambivalence about selfhood as the root of suffering. Nietzsche's Birth of Tragedy deploys the term in its Schopenhauerian register as the Apollonian principle of bounded form against Dionysian dissolution. Simondon's philosophical project, while never citing Jung, constitutes a parallel and competing account, displacing the principle from substance (form or matter) onto process itself — onto ontogenesis, metastability, and transindividuality. Together these voices pose the central tension: is individuation a principle defending selfhood against chaos, or is it itself the problem that a deeper philosophy of relation must overcome?
Hence the natural striving of the creature goeth towards distinctiveness, fighteth against primeval, perilous sameness. This is called the PRINCIPIUM INDIVIDUATIONIS. This principle is the essence of the creature.
Jung's canonical definition in the Sermones: the Principium Individuationis names the creature's constitutive drive toward distinctiveness against the Pleromatic sameness that would dissolve it into nothingness.
, Memories, Dreams, Reflections, 1963thesis
Hence the natural striving of the creature goeth towards distinctiveness, fighteth against primeval, perilous sameness. This is called the PRINCIPIUM INDIVIDUATIONIS. This principle is the essence of the creature.
Edinger reproduces Jung's Sermones definition verbatim, treating the Principium Individuationis as the foundational axiom from which the alchemical symbolism of distinction and the pairs of opposites derive their psychological necessity.
, Anatomy of the Psyche: Alchemical Symbolism in Psychotherapy, 1985thesis
The term individuation, or rather the principle inherent in the human being that impels us toward individuation, is explicitly mentioned by Jung in this sermon as the 'natural tendency called Principium Individu
Hoeller identifies the Principium Individuationis as the psychologically operative term in Jung's First Sermon, connecting the Pleromatic return-drive with the individuation process in depth-psychological terms.
, The Gnostic Jung and the Seven Sermons to the Dead, 1982thesis
Man becomes through the principium individuationis. He strives for absolute individuality, through which he ever increasingly concentrates the absolute dissolution of the Pleroma.
The Red Book formulates the paradox at the heart of the principle: the more intensely the individual concentrates, the more it mirrors and condenses the infinite Pleromatic fullness, becoming a 'shining star' that is simultaneously utterly singular and cosmically vast.
, The Red Book: Liber Novus, 2009thesis
the mercurial essence, the principium individuationis, would have developed freely under natural conditions, but was robbed of its freedom by deliberate intervention from outside, and was artfully confined and banished like an evil spirit.
In the alchemical context Jung equates the mercurial spirit with the principium individuationis and interrogates the tradition — Schopenhauer, Buddhism, Christianity — that views individuation as the source of evil requiring confinement or redemption.
, Collected Works Volume 3: The Psychogenesis of Mental Disease, 1907thesis
The approach of much Indian thinking, Hindu and Buddhist alike, appears to be the very obliteration of individual consciousness which Jung warns us about in connection with the submerging of the soul into the Pleroma.
Hoeller argues that Eastern practices of ego-dissolution represent precisely the Pleromatic submersion that the Principium Individuationis guards against, casting the principle as a defense of psychological vitality against spiritual self-annihilation.
, The Gnostic Jung and the Seven Sermons to the Dead, 1982supporting
principium individuationis, 64
The index entry for Aion confirms the term's structural presence in Jung's systematic Christological and alchemical phenomenology, co-located with the pleroma and prima materia.
, Aion: Researches into the Phenomenology of the Self, 1951supporting
principium individuationis, see individuation
Nietzsche's Birth of Tragedy deploys the term in its Schopenhauerian register as the principle of Apollonian bounded individuality, the index cross-reference confirming its role as a structuring concept in the work's Dionysian/Apollonian dialectic.
, The Birth of Tragedy, 1872supporting
To seek the principle of individuation in a reality that precedes individuation itself is to consider individuation strictly as onto-genesis. The principle of individuation is then the source of haecceity.
Simondon's ontogenetic critique relocates the principle of individuation from substantialist supports (atom, matter, form) to the process of individuation itself, making haecceity an emergent rather than pre-given property.
, Individuation in Light of Notions of Form and Information, 2020supporting
Without researching the principle of individuation, the following question can be posed: what is individuation? Yet here an important divergence appears between two groups of notions.
Simondon distinguishes between asking what makes an individual what it is internally versus what makes it differ from all other individuals, arguing that conflating these two aspects has vitiated classical accounts of the principle.
, Individuation in Light of Notions of Form and Information, 2020supporting
The first presupposition has an ontological characteristic in the sense in which takes for granted that the individual is the essential reality to be explained.
Simondon's opening critique targets the Aristotelian presupposition that underwrites all classical formulations of the principium individuationis: that the individual is the primary ontological unit demanding explanation.
, Individuation in Light of Notions of Form and Information, 2020supporting
A tree, therefore, is often a symbol of personality... It is the prototype of the self, a symbol of the source and goal of the individuation process.
Jung's association of the oak with the self as 'prototype' and 'goal of the individuation process' contextualizes the Principium Individuationis within alchemical plant symbolism, linking the principle's telos to the archetype of the Self.
, Alchemical Studies, 1967aside
We ourselves, however, are the Pleroma, so it is that the Pleroma is present within us. Even in the smallest point the Pleroma is present without any bounds, eternally and completely.
Hoeller's exposition of the First Sermon's Pleromatic ontology provides the cosmological ground against which the Principium Individuationis operates as differentiating counterforce.
, The Gnostic Jung and the Seven Sermons to the Dead, 1982aside