The GENERAL CONTEXT of such use is:
duality:
The term refers to the 'duality' of any Corporeal Life-form, such as a human being, wherein one-half of the duality is the twin of corporeality, and the other half of the duality is the 'twin' of incorporeality. The twin-duality is visible, physical, material and corporeal, and occupies time and space, within the Dimension of the Condensate of Corporeality of the Life-form. The 'twin'-duality is invisible, non-physical, non-material and incorporeal, occupies no time and space, yet exists within the exact same 'Dimension' as the Dimension of the Condensate of Corporeality, but is, instead, a Condensate of Incorporeality.

There are numerous other Dualities in the Cosmos, which I mention in my Book. (See the bottom of this page for the Book info.)

Duality exists in the Cosmos (Positivity:Negativity; Differentiated Relativity:Undifferentiated Relativity; etc.) God wishes to bring it all together, in wholeness (The Law of One). Oneness, as a whole, can only BE, when each individual piece thereof is WHOLE and COMPLETE (free and fulfilled) ITSELF!