…the unconscious…by definition and in fact, cannot be circumscribed. It must therefore be counted as something boundless: infinite or infintesimal. Whether it may legitimately be called a microcosm depends simply and solely on whether certain portions of the world beyond individual experience can be shown to exist in the unconscious – certain constants which are not individually acquired but are a priori presences.
The theory of instinct and the findings of biology in connection with the symbiotic relationship between plant and insect have long made us familiar with these things…A general proof of the rightness of this expectation lies in the ubiquitous occurrence of parallel mythologems, Bastian’s ‘folk-thoughts’ or primordial ideas; and a special proof is the autochthonous reproduction of such ideas in the psyche of individuals where direct transmission is out of the question…
Mythologems are the aforementioned ‘portions of the world’ which belong to the structural elements of the psyche. They are constants whose expression is everywhere and at all times the same. (C.G. Jung, Medicine and Psychotherapy).
The unconscious – with its numinous action – is therefore not confined to the individual soul; it surpasses it in every direction. Being ‘something boundless’, the unconscious is the world seen under its psychic aspect. Which means to say that it consists not only of innate – ie, prenatal, individual tendencies and inclinations, but that it also includes what we have designated as ‘spheres’ – namely the ‘sphere of the Holy Spirit’ and that of the ‘false Holy Spirit’.
Action of a numinous character from the unconscious, thus conceived, is certainly a criterion sufficient to distinguish the manifestation of the reality of the unconscious from the manifestation of the subjectivity of the individual soul through the latter’s spontaneous fantasy, feeling and intellectuality, but it does not at all suffice to distinguish the truth within this reality, ie, to distinguish the action of the sphere of the Holy Spirit from that of the sphere of mirages. For the sphere of mirages, also, is real – but reality is one thing and truth is another thing. A mirage is certainly real, but it is not true; it is deceiving.
Unknown Author, Meditations on the Tarot, Letter XXII, The World