Brahman is the ultimate reality or God.in truth+

Brahman is the Ultimate Reality or God. All reality has its source in Brahman. All reality has its grounding sustenance in Brahman. It is in Brahman that all reality has its ultimate repose. Vedas specifically, consciously and exclusively aim toward this reality termed Brahman.

In the 'Taittiriya Upanishad' II.1:~ Brahman is described in the following manner: "Satyam Jnanam Anantam Brahma", "Brahman is of the nature of truth, knowledge, and infinity." Infinite positive qualities and states have their existence secured solely by virtue of Brahman's very reality. Brahman is a necessary reality, eternal (i.e., beyond the purview of temporality), fully independent, non-contingent, and the source and ground of all things. Brahman is immanently present in the realm of materiality, interpenetrating the whole of reality as the sustaining essence that gives it structure, meaning, and existential being, yet Brahman is simultaneously the transcendent origin of all things (thus, panentheistic).

Even Brihadaranyaka Upanishad: ~ Brahman (God in truth) is in the form of the Athma, and it is indeed Athma itself.

Sage Sankara’s Supreme Brahman is impersonal, Nirguna (without Gunas or attributes), Nirakara (formless), Nirvisesha (without special characteristics), immutable, eternal, and Akarta (non-agent). It is above all needs and desires. It is always the Witnessing Subject. It can never become an object as it is beyond the reach of the senses. Brahman is non-dual, one without a second. It has no other besides it. It is destitute of difference, either external or internal. Brahman cannot be described, because description implies a distinction. Brahman cannot be distinguished from any other than It. In Brahman, there is not distinction between substance and attribute. Sat-Chit-Ananda constitutes the very essence or Svarupa of Brahman, and not just Its attributes. The Nirguna Brahman of Sage Sankara is impersonal.

The Soul, the ‘Self itself is  Brahman or Infinite God in truth.

The Soul is the Self. God is the Soul, which is present in the form of consciousness. God is the fullness of consciousness without the illusory division of form, time, and space. Therefore, there is nothing apart from it.

God in truth is self-evident. God in truth is not established by extraneous proof. It is not possible to deny God in truth because God is the very essence of the one who denies it. God in truth is the basis of all kinds of knowledge, presuppositions, and proofs. God in truth is hidden by the illusory universe in which you exist, God in truth is without the universe in which you exist.

God is the Supreme Being the One eternal homogeneous essence, indivisible consciousness, and intelligence, which is beyond form, time, and space. To which the Sages describe in a variety of ways through diverse words.

Bhagavad Gita: ~ ‘All those whose intelligence has been stolen by material desires, they worship many Gods. (7- Verse -20)

Only the path of wisdom leads the seeker of truth on his journey to the ultimate realization of the true nature of the Universal Essence, which is the Soul. The Soul is present in the form of consciousness.

Bhagavad Gita: 7: 19:~ "Such a man who has attained true knowledge, the knowledge of Self, the knowledge of Atman, worships ‘Self’ as~ Atman (God) alone exists~ everything is Atman, there exists nothing except Atman. Such a man is extremely rare."

Bhagavad Gita: ~ Brahmano hi pratisthaham ~ Brahman (God) is considered the all-pervading consciousness, which is the basis of all the animate and inanimate entities and material. (14.27).

When Bhagavad Gita says, God is considered the all-pervading consciousness which is the basis of all the animate and inanimate entities and material then nothing has to be accepted as God other than consciousness. : ~Santthosh Kumaar