Knowledge of the single stuff is Advaitic wisdom.+

Advaita is universal. Advaita is not for sale. Do not buy Advaita from the spiritual supermarket. Advaita is the nature of the Soul, the Self. The world in which you exist is created out of single stuff. That single stuff is consciousness. Knowledge of the single stuff is Advaitic wisdom. 

Advaitic truth is very simple, but it is very difficult to realize because you have accumulated mental garbage from different sources in the name of Advaita. Until you discard all the accumulated knowledge you will never be able to realize the Advaitic truth, which is beyond form, time, and space. 

The Advaita is the nature of the Soul, the innermost Self shines in its own awareness when wisdom dawns. 

The Advaita is the Soul is the cause and the support of all that exists in the world in which we exist.

The Advaita is present in the form of consciousness. Advaita is the root element of the universe. From the Advaita, the universe comes into existence. In the Advaita, the universe resides. And into the Advaita, the universe is dissolved. The Advaita is the parent of all that is there. 

Katha Upanishad says:~ Fools dwelling in darkness, but thinking themselves wise and erudite, go round and round, by various tortuous paths, like the blind led by the blind. (Ch~ II-5 P-14)

Those who indulge in the perverted argument on their own standpoint and opinion are not seeking the truth, which is beyond form, time, and space.  They just want to exhibit their accumulated knowledge accumulated from here and there.  They think what they know is the ultimate truth.

They think whatever they propagate is the ultimate truth. The question never occurs to them, “Is what I know really the truth?

Advaitic Gnana or ‘Self’-Knowledge which is contentless is not ordinary dualistic knowledge. People have no idea of the ‘Self’-knowledge or Brahma Gnana or Atma Gnana yet. "Intellect" is a dangerous word to use as a translation of Gnana. For instance, some mathematical wizard has a tremendous intellect; one can follow their mathematical equations, yet does it mean that the mathematical wizard possesses Gnana or ‘Self’-knowledge? Dualistic knowledge based on a dualistic perspective is not  Advaaitic Gnana or ‘Self’-knowledge.

Gnana is usually translated as "knowledge", but that is because there is no equivalent word in English. It is more accurately "contentless consciousness" or “awareness”. Consciousness usually implies something, thoughts, or things, but in the non-dualistic or Advaitic perspective, we give it,  in addition,  the meaning of consciousness per se or awareness without an object, as in deep sleep.

Remember:~

Realizing the truth everything is made of the same substance, whether it be inside--as in dreams ~or outside as in waking is Gnana.  Realizing whatever is seen as an object, heard as sound or name is of the same substance is Gnana.

 Soulcentric Reason is not intellect. Soulcentric Reason is that which finally distinguishes between real and unreal, false and true, and therefore it takes all three states into account. Until that is attained people generally use only intellect (egocentric reason) which is confined to the waking state only. Intellect (egocentric reason) evolves into Soulcentric Reason as man realizes that the study of the waking world is not enough, and that study of all the phenomena of consciousness is required. Such a study must embrace dreams and sleep; hence there is no perfection of reason without an analysis of the three states.

The TheSoulcentric reason distinguishes the ultimate reality from the rest.' Egocentric reason discrimination between good and bad right and wrong is confined to the physical plane, it is intellect, and logic.

The Soulcentric reason is that which enables one to distinguish the real from the unreal, true from false. People do not clearly know the difference between egocentric and Soul-centric reason.:~Santthosh Kumaar