According to Advaita Vedanta, the Veda addresses itself to two kinds of audiences - the ordinary ones who desire the transitory heaven and other pleasures obtained as a result of ritual sacrifices, and the more advanced seeker who seeks to know Brahman.

According to Advaita Vedanta, the Veda addresses itself to two kinds of audiences - the ordinary ones who desire the transitory heaven and other pleasures obtained as a result of ritual sacrifices, and the more advanced seeker who seeks to know Brahman. Thus, the purva mimam.sa, with its emphasis on the karma kanda of the Vedas, is meant for the first audience, to help lead its followers along the way. However, the Vedanta, with its emphasis on the jnana kanda, is meant for those who wish to go beyond such transient pleasures.

Sri, Sankara says in Brahma Sutras: that Brahman is the cause of the world, whereas in Mandukya he denies it. This is because he says that at the lower stage of understanding, the former teaching must be given, for people will get frightened as they cannot understand how the world can be without a cause, but to those in a higher stage, the truth of non-causality can be revealed.

Sage Sri, Sankara himself has warned us not to use ambiguous words, and to practice semantic analysis in his book "Definition of one's own Self.( Page 199, v.24 of "Sankara's Selected Works)

Sri, Sankara founded his Advaita Vedanta either on reason independent of sruti or on sruti confirmed by reason."   Sri, Sankara's commentary on the Mandukya Upanishad, II, 1:  This [the unreality of duality] is borne out by the Srutis ... But it is possible also to show the unreality of the object world even from pure reasoning, and this second chapter is undertaken for that purpose.

 Sri, Sankara himself had often said that his philosophy was based on Sruti, or revealed scripture.  This may be because Sri, Sankara addressed the ordinary man, who finds security in the idea of causality and thus in the idea of God—and Revelation is indispensable to prove the latter.  He believed that those of superior intelligence, have no need of this idea of divine causality, and can therefore dispense with Sruti and arrive at the truth of Non-Dualism by pure reason. 

Sri, Sankara, in debates with Buddhists and others who did not recognize the authority of the Vedas, had been obliged to prove the truth of Advaita by means of reason alone.  Mandukya Upanishad, a scripture which appealed to reason to the exclusion of Revelation. 

Nonduality does not need the support of any Scripture or Revelation like the Veda. For it is based, not upon the varying theological fancies, which are as numerous as the sands of the sea, but upon reason, the common heritage of all mankind, irrespective of colour or creed or clime.

Upanishad says:

  This Atman cannot be attained by the study of the Vedas, or by intelligence, or by much hearing of sacred books. It is attained by him alone whom It chooses. To such a one Ataman reveals Its own form. [Katha Upanishad Ch-II -23-P-20]

Mundaka Upanishad  :-

This Atman cannot be attained through study of the Vedas, nor through intelligence, nor through much learning. He who chooses Atman—by him alone is Atman attained. It is Atman that reveals to the seeker Its true nature. ( 3 –page-70

Mundaka Upanishad  Upanishads by Nikilanada)

When the Upanishads say:-

It is attained by him alone whom It chooses. To such a one Atman reveals its own form.  Then what is the use of indulging through our intelligence or our accumulated knowledge, when one is not chosen by the self, which is the soul, which is in the form of consciousness.

There is no need for any philosophy in pursuit of truth because they take the seeker nearer to truth but they create more doubts and confusions.

 

The scriptures and theories and teaching based on the ego are not the yardstick. Using them as yardstick to understand and assimilate the truth will lead one towards pursuit of arguments. Seeker of truth has to discover on his own, the truth of his true existence by inquiring “what is mind?” and “what is substance of the mind?” and move forward.  

The ultimate truth is one without the second, the one is not in the sense half or two, but the one that remain forever One, without the second.  The consciousness is all pervading. There is no place where consciousness is not.

Consciousness is in everyone, consciousness is in everything .consciousness is one behind many. Consciousness alone is. It means the universe and its contents are the visible form of consciousness. And consciousness in turn is invisible form of the universe, which appears as mind.  

That is why Sri, Sankara says in commentary in Vedanta sutra that what is accepted without proper enquiry will not lead a person to the final goal. On the contrary, such acceptance will result only in evil, in something which is detrimental to our spiritual progress.   Seeker of truth should not believe blindly in traditional orthodox nonduality without verifying all the facts from every angle. One has to reflect through reasoning over and over again without getting tired of the process.

Swami Vivekananda said: - “You have to grow from the inside out. None can teach you, none can make you spiritual. There is no other teacher but your own soul.”

For the same reason Raman Maharishi said:  fortunate are the one who do not lose themselves in the labyrinths of philosophy. Bhagwan says: Take Vedanta, for instance: it speaks of 15 pranas the names and functions of it   which the student is asked to commit memory. Will it not be sufficient if he thought, only one prana does the whole work of maintaining the body? Again the antakaran is said to think, to desire, to will, to reason etc. Why all these details? Has anyone seen antakarana, or all these pranas? Do they really exist? They are conceptual divisions invented by teachers of philosophy by their excessive analysis. Where do all these concepts end? Why should confusion created and then explained away? Fortunate is the man who does not lose himself in the labyrinths of philosophy, but goes straight to the source from which they all arise. (GURU RAMANA .By S.S Cohen -vii Danger of philosophy-Page -58-59)

Buddha Said: - Believe nothing because a wise man said it,
Believe nothing because it is generally held.
Believe nothing because it is written.
Believe nothing because it is said to be divine.
Believe nothing because someone else said it.
But believe only what you yourself judge to be true.

(from The Mystic Vision
Compiled by Andrew Harvey and Anne Baring)

Thus    Seeker of truth should not believe blindly any teaching without verifying all the facts from every angle. One has to reflect through reasoning over and over again without getting tired of the process.