To know what God is, we must know what the ‘Self’ is in actuality.+

To know what God is, we must know what the ‘Self’ is in actuality. In deeper self-search, we become aware of the fact that our body, ego, and our experience of the universe are created out of single stuff, which is the Soul or consciousness.

Due to ignorance, we identify the Soul with the body and we become egocentric. When we become aware of the fact that, the Self is not the form but the Self is formless then we become Soul -centric and realize the fact that all the three states are merely an illusion created out of consciousness. Thus, consciousness is the ultimate truth or Brahman. Consciousness is the Self because the Soul is present in the form of consciousness. 

Rig Veda: ~ The Atman is the cause; Atman is the support of all that exists in this universe. May ye never turn away from the Atman, the Self. May ye never accept another God in place of the Atman nor worship other than the Atman?" (10:48, 5)

The Ultimate truth is Brahman or God in truth.

Even Rig Veda says: ~ 'Prajnanam Brahma'  - Consciousness is the ultimate reality or Brahman or God in truth.

Thus, the seekers and move ahead and reach the nondual destination through this mental (inner) journey.

In spirituality, the word “God” stands for the ultimate truth or Brahman. All that is needed then is to realize the fact that, that Self is not the body (you), not the mind, but the Soul, the Self. The Soul is present in the form of consciousness (spirit). Thus, consciousness is the ultimate truth or Brahman.

Brahman is God. Firm conviction about the Soul as the Self leads to nondualistic Self-awareness. Self-awareness is God-awareness. : ~ Santthosh Kumaar