Oneness is defined as a “state of being unified or whole, though comprised of two or more parts.” Oneness is not only a concept, but a potential of the Self. Carl Jung spoke of Self realization in terms of wholeness and integration. Indian spiritual texts speak of the supreme Self (Atman) as One or non-dual.
In becoming aware of the supreme nature of the Self , we are likely to behold the demons and shadows of the individual self. In Indian philosophy, the demon is known to be an image of ignorance and falsehood. Carl Jung believed that an encounter with the demon or monster represented an archetypal stage in the process of individuation. He says, “the initial encounter with the Self casts a dark shadow ahead of time.” In mythic terms the shadow may present itself as a monster, a demon, a darkness or a drought. Here is the full quote from Jung’s Man and His Symbols: