Sage Sri Sankara:~ " "The highest beatitude is not to be attained by Yoga."

The path of religion, the path of yoga and the path of wisdom were intended for different classes of people. The wisdom is for the advanced seekers of truth. It deals with the nature of the ultimate Truth and Reality. It is meant for superior aspirants who have an inner urge to know the truth which is beyond the form, time and space.

What is the use of practicing Samadhi within the dualistic illusion?  Samadhi belongs to yogic path.

Sage Sri 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 Sri Sankara in 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.  And yogic Samadhi is not non dual Self-awareness’s.

Panchadasi ~ :~  impossibility of yoga arriving at a successful end to its practices.  ~ P.509 v, 109

The notions of ‘Self-realization through yoga   is not philosophic. Every yogi who shuts himself in a cave is not thereby freed from thinking. 

Yoga can lead only to temporary peace, because the world is subject to change. Only self- knowledge or Brahma Gnana or Atma Gnana can yield Advaitic awareness in the midst of the form, time and space.