Upanishad says: ~ Atman, the Self is known by Reason alone.+

The Reasoning is interpretable in two ways. The egocentric interpretation is to apply it only to the practical purpose (waking experience).

The Soulcentric interpretation is to apply it to the three states. The latter leads to the final settlement of the problems because it takes all data into consideration.

Bhagavad Gita: ~ Reason as a means to reality. (Chap.18 verse 37)

In chap. 10 of in Bhagavad Gita, Krishna says: ~ I cannot save you, but I can give you Buddhi (reason). (chap. 10)

In chap. 10 of in Bhagavad Gita, Krishna says: ~ "I have given you the most secret teaching, now reflect over it all" Krishna plainly says reflect, think. (Verse 63 of Chap. 18)

Mundaka Upanishad says: ~ “Both states are harmful and take you away from the path of inquiry into truth. (Page 234)

Ashtavakra Gita: ~ “It is not the absence of Buddhi (Reason) that can grasp Advaita but the man who possesses the highest intellect. Brains are necessary. Such a man, by merely hearing the truth mentioned will know it. (Page~ 224)

Brihad Up.: To see Him whole mystics may have similar ideas of the "universe in a dew-drop," but Advaitic truth demands proof. (Page 78)

Upanishad says: ~ Atman the innermost Self is known by Reason alone, by sharpened and purified intellect. Yet still people worship Yoga and mysticism as the sole means of attaining Atman.

The universe in which you exist is an illusion and there is no substance in its reality."

Self-knowledge or Brahma Gnana or Atma Gnana is the end of all egocentric knowledge. Egocentric knowledge is the dualistic knowledge, whereas Self-knowledge is the Soulcentric knowledge.

Advaitic wisdom has nothing to do with orthodox Advaita, which is dualistic. Orthodox Advaita is a sect, which blindly accepts and follows dogmas and superstitions.

Sage Sankara says: ~ “What is accepted without proper inquiry will not lead to the final Goal. (Commentary on Vedanta Sutra)

Nothing has to be accepted as truth without verification.

Sage Sankara himself had often said that his philosophy was based on Sruti, or revealed scripture. This may be because, Sage 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.

Sage Sankara is the only sage who has final authority on the Advaitic truth. The Advaitic truth is rational truth and scientific truth without dogma. : ~ Santthosh Kumaar