Lord Krishna Advaitic wisdom the oldest wisdom of India has been lost: people misinterpret and falsify it today as they did then.+

Bhagavad Gita 2:46:~  "A man of true knowledge who has attained enlightenment, has the same use for all the scriptures as one has a small reservoir of water in a place flooded on all sides."

The rituals mentioned in the karmakanda of the Vedas are sought to be negated in the jnanakanda which is also part of the same scripture. While the karmakanda enjoins upon you the worship of various deities and lays down rules for the same, the jnanakanda constituted by the Upanishads ridicules the worshipper of deities as a dim-witted person no better than a beast. Karmakand of the Vedas are sought to be negated in the jnanakanda which is also part of the same scripture. While the karmakanda enjoins upon you the worship of various deities and lays down rules for the same, the jnanakanda constituted by the Upanishads ridicules the worshipper of deities as a dim-witted person no better than a beast.

This seems strange, the latter part of the Vedas contradicting the former part. The first part deals throughout with karma while the second or concluding part is all about jnana. 

Owing to this difference, people have gone so far as to divide our scripture into two sections: the Vedas (that is the first part) to mean the karmakanda and the Upanishads (Vedanta) to mean the jnanakanda. Karmakanda and the Upanishads (Vedanta) to mean the jnanakanda.

Sage Sankara:~  VC Let erudite scholars quote all the scripture, let Gods be invoked through sacrifices, let elaborate rituals be performed, let personal Gods be propitiated---yet, without the realization of one‘s identity with the Self, there shall be no liberation for the individual, not  even in the lifetimes of a hundred Brahmas put together (verses-6)

It is clear that the liberation cannot be the result of good works, for Sruti itself declares that there is no hope for immortality by means of wealth for immortality by means of wealth.  (Verses -7)

Sage Sankara said:~ Neither by the practice of yoga nor philosophy, nor by good works, nor by learning, does liberation come, but only through the realization that Atman and Brahman are one in no other way. (1) VivekaChudamani v 56, pg 25

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 the 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  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. (Chap.IV ) 

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." 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.

Lord Krishna says:~ “Those who know the Self in truth.". The last two words (tattvataha) are usually ignored by pundits, but they make all the difference between the ordinary concept of God and the truth about God. (Ch. V)

There is no need for any practice to realize the ultimate truth or Brahman or God.  Perfect understanding, assimilation of ‘what is what’ is very much necessary to realize the ultimate truth or Brahman, which is God.

Sage Sankara: ~ VC~"All this universe which through ignorance appears as of diverse forms, is nothing else but Brahman which is absolutely free from all the limitations of human thought.

Sage Sankara said:~  Talk as much philosophy as you like, worship as many Gods as you please, observe ceremonies and sing devotional hymns, but liberation will never come, even after a hundred aeons, without realizing the Oneness.

According to Advaita Vedanta, the Veda addresses itself to two kinds of audiences - the ordinary ones who desire the transitory heaven and other pleasures obtained as a result of ritual sacrifices, and the more advanced seeker who seeks to know Brahman. Thus, the Purva mimam.sa, with its emphasis on the karma kanda of the Vedas, is meant for the first audience, to help lead its followers along the way. However, the Vedanta, with its emphasis on the jnana kanda, is meant for those who wish to go beyond such transient pleasures.

Those who lack the intelligence to discriminate between formless witness (subject) and three states (object) will not be able to grasp what is real and what is unreal. Both subject and object are consciousness, not subject alone. :~Santthosh Kumaar