The nature of truth is, it can never be changed under any circumstances

The truth can never change. The nature of truth is, it can never be changed under any circumstances. It may be misrepresented. It must apply to the whole of existence, to the whole of the universe. It is in the object (three states) alone that one has all changes, as deeper analysis points out.

 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 goes, but the subject or knower of the body and the universe, can never go. 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 subject becomes object, or that object is subject.

If one wants to have absence of contradictions, absence of duality, there must be one entity, one being. If one has experience which is an object (mind), there is contradiction between subject and object, for "mind” is an object.

The duality is reality on the standpoint of the false self (ego or body as Self).  The duality is mere mirage on the base of the true self, which is formless consciousness. This understanding comes only to the serious seeker, who has real urge to know the ultimate truth, which is beyond the all the teachings and teachers. There is neither teaching, nor teacher, nor student in the realm of truth.  

The soul or consciousness is the innermost self. The soul or consciousness  is self-illumined”. So how can the body which is inert (insentient) and illumined by an external agent be the consciousness, which is present only within the waking or dream?

The consciousness (soul) the innermost self is apart from the three states and permanent, as it endures even after the death of the body and world   within the waking or dream.

Even the subtle body consists of many parts and is unstable. It is also an object of perception, is changeable, limited and non-existent by nature. So how can this be the true self, when the body exists only within the waking or dream?

The immutable soul, the substratum of the ego, is thus different from these two bodies, and is the true self, the consciousness, the formless witness of the three states; and it is present in everything and everywhere in all the three states  and yet transcends them all.

Thus the enunciation of the difference between the soul and the body has (indirectly) asserted, indeed, after the manner of the inquiry, analysis and reasoning, the reality of the three states. The birth, life, death and the world are part of the duality (waking or dream). The consciousness, which is the true self and it, is the formless witness of the birth, life, death and the world.

Thus the view that the body is the true self has been denounced by the enunciation of the difference between the soul and the body. The seeking mind has to grasp the truth, between the three states and the formless witness (true self).