The tremendum — Rudolf Otto's term for the overwhelming, awe-inspiring dimension of the numinous encounter — occupies a precise and consequential position in the depth-psychology corpus. Otto introduced it in 'Das Heilige' (1917) as one pole of the mysterium tremendum et fascinans, naming the quality of shuddering dread that confronts the human being before the wholly other. Jung absorbed the concept directly, applying it to the psychic domain: the tremendum marks the threshold beyond which the ego's sovereignty collapses before the autonomous power of the unconscious, especially of the complex. In Jung's usage, the researcher who penetrates toward the 'psychic tremendum' triggers the same cultural panic as the analyst who challenges a patient's inviolable complex — a transposition of theological category into clinical reality. Campbell and Hillman each extend the concept further: Campbell grounds the tremendum in the mythological function of evoking awe before the mystery of being, while Hillman provocatively insists that the divine tremendum need not arrive in vast and terrible forms but can manifest in the small tremor of an insect's brush against skin. The term thus travels from Otto's phenomenology of religion through Jungian psychology and onto mythological and ecological registers, remaining throughout a marker for the irreducible, non-rational encounter with overwhelming otherness.
Rudolf Otto (1869-1937), in his book The Idea of the Holy (tr. 1926; orig. 1917), defined the Tremendum as an aspect of the numinosum, 'numinosity,' which for him was the central characteristic of the Divinity.
Jung's editorial gloss establishes the precise Ottonian definition: tremendum is a constitutive aspect of the numinosum, designating the overwhelming character of divinity.
, Letters Volume 1: 1906-1950, 1973thesis
Rudolf Otto (1869-1937), in his book The Idea of the Holy (tr. 1926; orig. 1917), defined the Tremendum as an aspect of the numinosum, 'numinosity,' which for him was the central characteristic of the Divinity.
A direct restatement confirming that Jung consistently understood tremendum as Otto's technical denomination of the numinous quality central to the idea of the Divine.
, Letters Volume 2, 1951-1961, 1975thesis
every time the researcher succeeds in advancing a little further towards the psychic tremendum, then, as before, reactions are let loose in the public, just as with patients who, for therapeutic reasons, are urged to take up arms against the inviolability of their complexes.
Jung transposes the tremendum from theology into depth psychology, using it to name the overwhelming core of the unconscious that produces collective and individual panic upon approach.
, The Structure and Dynamics of the Psyche, 1960thesis
Theology says the divine is a tremendum, but a tremendum can come in small tremulous ways, a mere tremor, a shake, brush, shrug — the swift reaction to an insect.
Hillman radically democratizes the tremendum, arguing that the overwhelming sacred need not be vast or anthropomorphically grand but can manifest in minute animal encounters.
, Animal Presences, 2008thesis
Otto sets himself to discover the characteristics of this frightening and irrational experience. He finds the feeling of terror
Eliade's introduction to Otto situates the tremendum within the broader project of Das Heilige as the analysis of the irrational, terrifying dimension of sacred experience.
, The Sacred and the Profane: The Nature of Religion, 1957supporting
The Mysterium Tremendum in Robertson and Watts
Otto's own table of contents identifies Mysterium Tremendum as a named chapter heading, establishing it as a formal conceptual category within his systematic phenomenology of the holy.
, The Idea of the Holy: An Inquiry into the Non-Rational Factor in the Idea of the Divine and Its Relation to the Rational, 1917supporting
this 'feeling of reality', the feeling of a 'numinous' object objectively given, must be posited as a primary immediate datum of consciousness, and the 'feeling of dependence' is then a consequence, following very closely upon it
Otto situates the numinous feeling of reality — prerequisite to the tremendum — as a primary datum of consciousness from which the sense of creaturely dependence follows.
, The Idea of the Holy: An Inquiry into the Non-Rational Factor in the Idea of the Divine and Its Relation to the Rational, 1917supporting
religious feelings may be attached directly to the deity, as in Otto's mysterium tremendum, or to the beliefs, rituals, practices, symbols, and communities built around God.
Pargament deploys Otto's mysterium tremendum as a paradigm case of direct religious feeling attached to the divine, distinguishing it from mediated forms of religious experience.
, The psychology of religion and coping theory, research,, 2001supporting
tremendum, 458, 463
The index entry for tremendum in Jung's Civilization in Transition confirms its active deployment across two substantial passages in the main text, signalling sustained engagement with the concept.
, Civilization in Transition, 1964supporting
tremendum, 200
The index entry for tremendum in Jung's Alchemical Studies places the term within alchemical-psychological discourse, indicating its appearance at a specific locus in the argument.
, Alchemical Studies, 1967supporting
the first function of mythology is to arouse in the mind a sense of awe before this situation... This I would regard as the essentially religious function of mythology — that is, the mystical function, which represents the discovery and recognition of the dimension of the mystery of being.
Campbell articulates the mythological function that corresponds structurally to the tremendum — the evocation of awe before the mystery of being — without using Otto's term explicitly.
, Thou Art That: Transforming Religious Metaphor, 2001aside