Manduka Upanishads:- Those that want Brahman (God) will inquire and practice discrimination.+

Manduka Upanishads:- Those that want Brahman (God)  will not practice control of the mind.  That is Yoga for duffers. The others will inquire and practice discrimination. (p.231)

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 a 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 the 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  Self is known by Reason alone, by the 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 knowledge is the end of all egocentric knowledge. Egocentric knowledge is dualistic knowledge, whereas Self-knowledge is Soulcentric knowledge.

Advaitic wisdom is 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 a 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 for 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. 

Remember:~ 

Sage Sankara says: ~“The exercise in discrimination between real and unreal and renunciation of the false is real meditation, then why you are indulging in other types of meditation.

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 non-Self.

Until you think you are an individual separate from the world and the world that existed prior to you and you are born in it afterward the ignorance will prevail as a reality. Till ignorance is there the universe prevails as reality.

Sage Sankara says: ~ “The exercise in discrimination between real and unreal and renunciation of the false is real meditation, then why you are indulging in other types of meditation.

Perfect understanding and realization of ‘what is what’ leads to Self-awareness. By holding onto theories one remains in the realm of duality. You have to mentally go on dropping what is not the truth through deeper Self-search. 

Finally when you become aware of the fact that, your ego, your body, and the world are one in essence then there is Self-awareness in the midst of duality. : ~ Santthosh Kumaar