A yogi cannot attain realization, because he thinks his body to be body and world to be world and fails to see them as consciousness.+

Why is the word Yoga used in so many different senses in the Gita? Because there are grades and the highest demands concentrated brains, not sitting mindless and imagining you are seeing God.

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 Krishna calls it "the supreme secret." Lord Krishna points out that the yoga must-see is "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 the realization of the universal spirit as the result.

Manduka Upanishad:~ Yoga is in the sphere of duality and is unnecessary to one who knows non-duality.

A yogi cannot attain realization, because he thinks his body to be body and world to be world and fails to see them as consciousness and thinks his experience of Samadhi is because of his individual effort.

The individual experience is limited to waking experience and is merely an illusion. Thus even his Samadhi is also limited to the waking experience, which is merely an illusion.

Yogi thinks the thoughtlessness is Samadhi but thoughts are of individuality. Thoughts disappear even in deep sleep. Therefore deep sleep is not wisdom.

If one thinks thoughtlessness is Samadhi and Samadhi is Brahman then anyone can get knowledge of Brahman by taking sleeping pills or hemp.

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

One who is in Samadhi will not know that this universe as the consciousness; therefore yoga is not the means to Self- knowledge or Brahma Gnana or Atma Gnana.

In Samadhi the yogi knows nothing and sees no universe; so if there is nothing but blankness. The blankness is not the Advaitic wisdom.

The yogi does not know the nature of the universe. If the universe is not seen in the Samadhi then there is no need to use the word Atman and Brahman. The yogi is unaware of the truth, which is beyond form, time, and space.

By shutting his eyes in Samadhi, the yogi does not know the universe, which confronts him. Hence the universe can't be known as the Soul or the consciousness through yoga.

One is in a non-dual condition in deep sleep or Samadhi, One without a second, true, but he did not know it at the time. He says only in the waking experience afterward. Hence, there must be an inquiry so that you find non-duality whilst you are awake so that you can see nonduality at the time not afterward. Hence, too the need for inquiring into the nature of the universe and knowing it as the Soul or consciousness whilst one is awake, and not during sleep or Samadhi.:~ Santthosh Kumaar