The whole Advaitic wisdom can be summed up in one sentence ~ ‘There is nothing else but Brahman.+

People think Advaita is the best because the Vedas say so.  One can arrive at the same conclusion without any scripters by way of reasoning based on the Soul as the Self. The soul is present in the form of consciousness. 

The habitual reasoning is based on the dualistic perspective to grasp, assimilate and realize the non-dualistic or Advaitic truth. The Advaitic truth is based on the nondualistic perspective.

The whole Advaitic wisdom can be summed up in one sentence, ‘There is nothing else but Brahman. It says that Absolute Existence, Absolute Knowledge, and Absolute awareness is Real. The universe is not real. It says that Brahman and Atman are one. The ultimate and the Absolute Truth is the Self, which is one though appearing as many in different individuals. The individual has no reality. Only the Self is real; the rest, mental and physical are but passing appearances.

 In fact Sage Sankara states a paradox- the world is and is not. It is neither real nor unreal. It leads us to recognize the existence of Maya (illusion). He thinks that the world is illusory from one perspective and from the second it is nothing but Brahman, Itself in manifestation. This apparent world is Maya and has its basis in Brahman, the Eternal. looks real. It has names and forms and actually, it is not real In the light of true knowledge, it disappears and Self-alone shines as real. However, Sage Sankara’s Mayavada has not been accepted by many preachers and philosophers.

Sage Sankara says clearly, that the universe is not real. He says that Brahman and Atman are one. The ultimate and the Absolute Truth is the Self, which is one though appearing as many in different individuals. The individual has no reality. Only the Self is Real; the rest, mental and physical are but passing appearances.

So then it indicates the form (waking or duality or mind) is unreal and the formless Soul (soul or consciousness) is real.  Therefore, only Atman is real, because there is no second thing that exists other than Atman, which is in the form of consciousness.

The ultimate truth or Brahman has nothing to do with the Scriptures and it is independent of the scriptures.  The point is: that though it is taught by the Vedas, it does not require any belief in the infallibility of Vedas; in other words even if an individual or some other religion were to propose the same thing, a person with an open mind would come to the same conclusion that there is a fourth state, that it is Brahman - and that it is the same as the Self.

The subject (formless witness) remains unchanged. The subject (formless witness), as such remains immortal. It can never die for it never changes. The body and world are an object and go, but the subject or knower of the body and the universe can never go. The seeker has to take this principle as his guiding thread and non-dual truth becomes easy to grasp. The formless witness can never be subject to the changes of the object; it is unchanged. The mistake usually made is that the subject becomes the object, or that the object is the subject.:~Santthosh Kumaar