All the religions of the world are based on the dualistic perspective. Whatever is based on the dualistic perspective is not spirituality.+

The world in which you exist is the product of ignorance. Ignorance is the cause of experiencing duality as reality.

The duality is present in the form of the mind.

The mind is present in the form of the universe.

The universe appears as waking or dream (duality) and disappears as deep sleep (nonduality).

The duality (universe or waking) is an illusion from the ultimate standpoint. 

All the thoughts, words,   feelings, attachments including you and your experience of the world are part of the dualistic illusion. The dualistic illusion (universe) is created out of single stuff. That single stuff is the Soul, which is present in the form of consciousness.  

The Soul is the innermost self.    From the standpoint of the Soul, the innermost self no second thing exists other than consciousness. 

For the dualists,   the world in which we exist is a reality.  The dualists are based on the ego. Their knowledge and dualistic philosophy are egocentric.  For the dualists, the experience of birth, life, death, and the world is a reality.  

All the religions of the world are based on the dualistic perspective. Whatever is based on the dualistic perspective is not spirituality.  Even the orthodox Advaita is also based on the dualistic perspective, therefore, it is nothing to do with Sage Sankara’s Advaitic wisdom.

For nondualists, the world in which we exist is an illusion.  The Nondualists are based on the Soul, the Self.  The knowledge and nondualistic philosophy are based on the Soul, the Self.

The seeker has to learn to view the worldview from the non-dualistic perspective, to realize Advaita (Soul) hidden by the illusory Dvaita (the world).  

The look of the world in which we exist will depend upon the medium through which the observer views it. In fact, our mental and intellectual conditions determine the world in which we exist (object), observed and experienced.  The commoner viewing the world will see differently from a Gnani viewing the same world. Each one interprets the world that they see in terms of their existing knowledge. The commoner sees everything based on the ego, therefore, he sees the world in which he exists as a reality, whereas a Gnani sees everything as the consciousness and he is fully aware of the fact that, there is no second thing that exists other than the Soul or the consciousness (subject). Thus, all the objective observation has to be bifurcated to realize the ultimate truth, which is beyond form, time, and space.

Only from the dualistic perspective, the changes take place. From the non-dualistic perspective, there are no changes.  Those who believe in the dualistic world as a reality feel the knowledge changes from time to time but they must realize their knowledge is limited to the form, time, and space whereas Self-knowledge is the knowledge of the beyond the form, time, and space.

The change is possible only in ignorance. Ignorance is the cause of experiencing the world which exists as a reality.   Consciousness is the cause of the world in which we exist and it itself is uncaused.

The world in which we exist is dependent on the consciousness for its existence but the Soul, which is present in the form of consciousness, is independent.  From the standpoint of the Soul, the innermost Self, the world in which we exist is merely an illusion.

 Only within the illusion the changes take place, the illusory changes within the illusion are bound to be an illusion. In reality, consciousness alone is real and eternal. Thus, the knowledge of the eternal will be always eternal. The intellectual knowledge based on form, time, and space is bound to change from time to time as science progresses in its dualistic inventions.     

The consciousness is ever changeless because it is a formless, timeless, and spaceless existence. 

Sage Sankara’s wisdom is not teaching or philosophy but Advaita is the universal wisdom. Advaitic wisdom is neither a teaching nor a theory but it is mere guidance to those who are seriously seeking the ultimate truth or Brahman. Grasp the ultimate truth anytime, any age, if the seeker has the spiritual maturity and capacity to grasp it. 

Sage Sankara says: ~ VC-47   All the effects of ignorance, root, and branch, are burnt down by the fire of knowledge, which arises from discrimination between these two—the Self and the not-Self.

It really depends on his inborn natural capacity to understand and assimilate it.  Sage Sri, Sankara’s wisdom is a Self-examiner, to test oneself to discover how near to Gnana he has approached and what progress has already been made on the path, and what still remains to be done.  It sets up a criterion for Self-judgement.   There are millions in search of truth but one in million will be able to grasp it.

Without Sage Sankara, there is no Advaita (nonduality).  Since it was mixed up with orthodoxy there is a lot of confusion. I am highlighting all the obstacles, which are blocking one from realizing the ultimate truth or Brahman. There are so many non-dualistic masters of the east and also from the west who expound Advaitic or non-dualistic knowledge but none of them are helpful to reach the ultimate end.

One has to know and realize his innermost Self is Soul and identify it as his true identity to find liberation from the bondage of the illusion of birth, life, death, and the world(duality).   The goal of our life is to find and realize our identity with our Soul, which is our Self. 

Sage Sankara said:~ Neither by the practice of yoga nor philosophy, nor by good works nor by learning, does liberation come, but only through the realization that Atman and Brahman are one in no other way. (1) Vivekachoodamani v 56, pg. 25

To come to a more precise understanding of what non-duality is or might mean, we must return to the original linguistic and philosophic backgrounds from which the word has been translated into English.

 If we limit a probe of the meaning of non-duality to Hindu Sanskrit literature, we find that the most frequently used term is “Advaita.

Advaita” is not a religious concept.  Advaita is the nature of the existence hidden by form, time, and space.   The seeker has to attempt to rule out from the start a false understanding of reality by perfect understanding of ‘what is what’.

The Advaita is hidden by the dvaita. Advaita is the Soul, which is present in the form of consciousness. Dvaita is the universe.

Advaita is basically a denial; it is literally the negation of the dvaita.  That means whatever remains by negating the universe by realizing the universe is created out of single clay and that clay is the Soul, which is present in the form of consciousness, the hidden truth by dvaita uncovered.  Consciousness is the cause of the universe and it itself is uncaused.:~Santthosh Kumaar