In the Bhagavad Gita, Arjuna is granted a vision of the universal being in Chapter 11. It is an inspired passage and presents an overwhelming experience of the conscious being who IS the entire universal creation. All forms, all forces are expressions of that conscious Divine Existent. The Mundaka Upanishad, in a more compact format, provides a similar picture. “All this is the Brahman.”
Mundaka Upanishad, Chapter 2, Section 1, Verse 4 is translated by Sri Aurobindo: “Fire is the head of Him and His eyes are the Sun and Moon, the quarters are His organs of hearing and the revealed Vedas are His voice, air is His breath, the universe is His heart, Earth lies at His feet. He is the inner Self in all beings.”
This verse addresses the universal formations, the province of the various gods. Agni, the ‘knower of all things born’ is the head. Surya and Chandra, sun and moon, are the eyes. Vayu is the life force, prana. The universal being is revealed here as the “inner Self of all beings” so that there is no doubt that everywhere we turn, everything we see, all that we experience, externally and internally, is One Being, and there is nothing other than that One Being.
The normal human view, based in the ego consciousness, is to experience ourselves as separate beings and look at the universal creation as a collection of separately identifiable and separate forms; i.e., a fragmented view of the creation. This view, however, is illusory. Everything is not simply co-dependent and inter-dependent, but is actually One Being. The Upanishad is making this point through its illustrations and through the conclusion it draws.
Sri Aurobindo, The Upanishads, Mundaka Upanishad, pp. 193-210
Sri Aurobindo Studies 