“Investigation of the psychology of the unconscious confronted me with facts which required the formulation of new concepts. One of these concepts is the self. The entity so denoted is not meant to take the place of the one that has always been known as the ego, but includes it in a supraordinate concept. We understand the ego as the complex factor to which all conscious contents are related. It forms, as it were, the centre of the field of consciousness; and, in so far as this comprises the empirical personality, the ego is the subject of all personal acts of consciousness. The relation of a psychic content to the ego forms the criterion of its consciousness, for no content can be conscious unless it is represented to a subject.” Excerpt From Collected Works of C.G. Jung, Volume 9 (Part 2): Aion: Researches into the Phenomenology of the Self Jung, C. G., Hull, R. F.C., Adler, Gerhard This material may be protected by copyright.