Yajur Veda says: ~Those who worship visible things, born of the prakrti, in place of God are enveloped in still greater darkness.+

The famous peace invocation of Isa Upanishad says: ~

Om Purna- madah, purna-midam purnat-purnam-udacyate  Purnaysa purna-madaya purna-meva-vasisyate

This means ~ All this is full /from fullness, fullness comes when fullness is taken from fullness/ fullness still remains.

 This belief is all- comprehensive and all-absorbing. There is nothing that is not God.

One of Sage Sankara’s missions was to wean people away from ritualistic approach advocated by Mimamsakas and to project wisdom (jnana) as the means of liberation in the light of Upanishad teachings. Sage Sankara criticized severely the ritualistic attitude and those who advocated such practices. However, the texts that combined rituals with wisdom (jnana_karma_samucchaya) more in favor of the Mimamsaka position came onto vogue, projecting Sankara as the rallying force of the doctrine.

Avadhuta, the one who has cast off all concerns and obligations, like the Self, is the typical teacher of wisdom. He does that in a highly unconventional manner. He has no use for social etiquette; he has risen above worldly concerns. He is not bound by sanyasi dharma either. He roams the earth freely like a child, like an intoxicated or like one possessed. He is the embodiment of detachment and spiritual wisdom.

The concept of God with attributes and attributeless Gods was not of Vedic origin, because Yajur Veda says: ~ those who worship visible things, born of the prakrti, such as the earth, trees, bodies (human and the like), in place of God are enveloped in still greater darkness. Therefore, all these add-ons prove that the form and attribute-based concepts are introduced by some sages of the past with a new belief system and code of conduct in the name of Vedas. 

It clearly indicates that: -If the human goal is to acquire Self-Knowledge or Brahma Gnana or Atma Gnana then why one has to indulge in rituals and glorifying the conceptual gods and goddesses to go into deeper darkness. Instead, spend that time moving forward towards Self-knowledge, which is one’s prime goal.  

Since it is eternal and infinite, it comprises the only truth. The goal of Vedic religion, through the various yogas, is to realize that the consciousness (Atman) is actually nothing but Brahman.

The Vedic pantheon of gods is said, in the Vedas and Upanishads, to be only higher manifestations of Brahman. For this reason,- "ekam sat" (all is one), and all is Brahman.

Kena Upanishad (1) Chapter II:~  If you think: "I know Brahman well," then surely you know but little of Its form; you know only Its form as conditioned by man or by the gods. Therefore Brahman, even now, is worthy of your inquiry.

Kena Upanishad (2) Chapter II:~  The disciple said: I think I know Brahman. The disciple said: I do not think I know It well, nor do I think I do not know It. He among us who knows the meaning of "Neither do I not know nor do I know-knows Brahman.

Kena Upanishad (3) Chapter II:~ He by whom Brahman is not known, knows It; he by whom It is known, knows It not. It is not known by those who know It; It is known by those who do not know It.

Kena Upanishad (4) Chapter II:~ Brahman is known when It is realized in every state of mind; for by such Knowledge one attains Immortality. By Atman one obtains strength; by Knowledge, Immortality

Kena Upanishad (5) Chapter II:~ If a man knows Atman here, he then attains the true goal of life. If he does not know It here, great destruction awaits him. Having realized the Self in every being, the wise relinquish the world and become immortal

Thus, the goal is to realize the Atman (consciousness).  The Atman (consciousness) is nothing but Brahman. By realizing Atman (consciousness) as Brahman (ultimate truth) is truth realization or Self-Realization. 

There is no need to follow the religion, study the scriptures or glorify the Gods and the Gurus and follow the path of doubts and confusion by losing oneself in the labyrinths of philosophy in order to get Self-realization when there is an easier path.  

By mentally tracing the source of the mind, from where it rises and subsides, one becomes aware of the fallacy of the mind, which rises as the duality (universe or waking or dream) and subsides as the nonduality (deep sleep).  The mind raises form the consciousness and subsides as the consciousness.

The essence of Mundaka is: Do not be satisfied with rituals, yoga, etc. which are good in their own way, but inquire. Into what? Brahman and Atman are things you can never see. So do not inquire into them. Inquire into the world around you, which you can see. Science tells you it is passing away every second. Everything is repeatedly dying. Where is it going? Thus you follow up your inquiry into what you can lay hands on. How can you inquire into Atma which you cannot see? So first we deal with the known and seen, this inquiry leads up to the unknown at the end.:~Santthosh Kumaar