In the image above, we see Vishvarupa, as the cosmic Person. The cosmic Person is the body and embodiment of Ultimate Reality (called Brahman in Sanskrit).
In art and in myth, the Cosmic Purusha is often depicted as being comprised of worlds (called Lokas). The body of Purusha contains lower worlds and upper worlds, places where Devas and Asuras reside. It is said that Enlightenment entails a movement toward the light of the Devas (spiritual truth), and away from the darkness of the Asuras (ignorance). Ultimately, this duality is resolved as we encounter the cosmic light and heart of Purusha. This inner heart is our own and it is cosmic. It does not find its location in any organ of the body, but is known as the center of existence. It is a symbolic heart: a symbolic light, ours and beyond ours.
It is also said that the Vedas (ancient Sanskrit texts) are the body of Ultimate Reality (Brahman). As we read the Vedas, and work with the symbols and concepts contained therein we inhabit a sacred body.
One hymn in particular is known for presenting the dialectics of Enlightenment. The hymn is called the Isha Upanishad. The dialectics of Enlightenment present two opposing ideas, which are integrated as the spiritual seeker realizes higher and higher levels of synthesis and integration. In the Vedas, the supreme dialectic is found between the Innermost Self (Ātman) and Ultimate Reality (Brahman). Enlightenment is an integration and unification of these two aspects of being.
The Isha Upanishad challenges us to integrate opposing forces within our own psyche so that we might be capable of realizing the supreme unity and of individual Self with Ultimate Reality. This realization is sometimes called non-duality and sometimes Oneness depending on spiritual teaching and historical context. I am going to go into some technical detail on regards to the Isha Upanishad so as to illustrate the dialectics at play.