A Gnani impart Self- Knowledge to others. A Yogi lies in Samadhi, so he does not know yogic Samadhi is not wisdom.+

A Gnani imparts Self- Knowledge to others. A Yogi lies in Samadhi like a wooden log so he does not know yogic Samadhi is not wisdom.  A Gnani is fully aware of the about all things, either permanent or perishable and he has realized both permanent and perishable to be consciousness.  Thus,  the consciousness alone is real and eternal all else is merely an illusion. 

Lord Krishna confesses that the oldest wisdom of India (our true Advaita philosophy) has been lost: people misinterpret and falsify it today as they did then. It is not yoga but philosophic truth. But nobody knows it. The teachers of philosophy and leaders of mysticism or religion do not want to inquire into the truth and have no time for it. (Gita –Chap- IV-v.2)

In Gita Chap.IV where Lord Krishna says: ~ "This yoga has been lost for ages" the word yoga refers to Gnana yoga, not other yogas: the force of the word this is to point this out.

Lord Krishna describes some of the other yogas but devotes this chapter separately to Gnana Yoga. So one sees even in those ancient days people did not care for Advaita; they wanted religion; hence, Gnana got lost. That is why Lord  Krishna calls it "the supreme secret." Lord Krishna points out that yoga must-see "Brahman in action."

Gita Chap.IV: "He who achieves perfection in Yoga finds the self in time." This means that after his yoga is finished, he begins the inquiry into ultimate truth and in due course this inquiry produces realization of the universal spirit as the result. 

Belief in Yoga is a self-mesmeric condition out of which it is extremely difficult to escape.

Sage Sankara:~  56. Neither by Yoga, nor by Sankhya, nor by good work, nor by learning, but by the realization of one's identity with Brahman is Liberation possible, and by no other means. 

Sage  Sankara says:~  Yoga is not the means of liberation (page 132-133 - Commentary on Brihadaranyakopanishad).

In Sutra Bashya and Mandukya:~ The Samadhi and sleep are identical.

Brihad Upanishad does not advocate Samadhi.

Sage  Sankara in the commentary to "Brahma Sutras:~  " "The highest beatitude is not to be attained by Yoga." (Sacred Books of East Series page 298 Vol.1.) And he also says Samadhi is the same as sleep (p.312) ---this indicates that yoga is not the means to self-realization.

Yoga can yield only the duality because everything that one can do or practice becomes a vanishing 'known.' It yields relative truth based on imagination, which is true from the physical viewpoint of view, not non-dual truth, which is the ultimate reality or Brahman.

As per the scriptures the three "Ashrams" or stages in life were originally intended for three grades of intelligence thus:

v             Religion: low intellects had to do 'karmas' works, ritual actions, chanting of mantras and indulging in Bajans and prayers, etc.

v             Middle intellects:  Yoga: taking yellow robes, going to caves, ashrams etc.

v             High intellects: wisdom who wanted the truth is concerned with no external rites or sanyasa, but depend solely on the intelligent inquiry for their path.

Bhagavad  Gita Chapter 6: ~ which deals with meditation, verses 11 and 12. It says "Yoga is for purification." This means it is not for truth but discipline.Chap.5 deals with renunciation. The Gita says throughout the book, not to rely on Yoga, but to rely on reason (Buddhi) (discrimination between real and unreal). 

Realizing the universe is created out of single stuff and that single stuff is the soul, which is present in the form of consciousness leads non-dualistic or Advaitic self-awareness. Self-awareness is freedom or Moksha. Moksha is unity in diversity in the midst of duality. 

The essence of Mundaka is:~  Do not be satisfied with rituals, yoga, etc. which are good in their own way but inquire. Into what? Brahman and Atman are things you can never see. So do not inquire into them. Inquire into the world around you, which you can see. Science tells you it is passing away every second. Everything is dying repeatedly. Where is it going? Thus, you follow up your inquiry into what you can lay hands on. How can you inquire into Atma which you cannot see? So first we deal with the known and seen, this inquiry leads up to the unknown in the end.

According to Sage Sankara, it is the ignorance of our real nature that causes suffering and pain. The desire for happiness is essentially a longing to awaken to who and what we truly are.

The Religion, the yoga, and the intellectualism are not the means to acquire self-knowledge or Brahma Gnana or Atma Gnana.  Without getting rid of the ignorance and trying to get self-awareness through religion and yoga is like a sleeping man trying to know what he is about, without waking up. As sleep is to waking, so is ordinary life to the state of realization.

Sage Sankara says Atman is Brahman and everything is Brahman is scientific declaration not religious or yogic. Sage Sankara and Sage Goudpada are more scientific than anyone else in the world. Since the real Advaitic essence is hidden it cannot be got without the inner (mental) journey.

Panchadesi:~ the impossibility of yoga arrives at a successful end to its practices. (P.509 v, 109)

All yogic miracles still start from the standpoint of the body and thus has nothing to do with Advaitic  Gnana.

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

Brih. Upanishad: page 32:~  "Yoga does not yield truth or liberation."

One may read the Mahabharata for all philosophical, yogic and cosmological teachings but in the end it finally says "All is imaginative."

Brihad Upanishad:~  It too declares Yoga cannot give you the truth.

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

Upanishad and one will see that it says Atman the innermost 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 illuminations gained by yoga or by trance states are always temporary ones.:~Santthosh Kumaar