Self-knowledge cannot be attained by the study of the Vedas and intellectual understanding or by bookish knowledge.+

Self-knowledge cannot be attained by the study of the Vedas and intellectual understanding or by bookish knowledge. Therefore, there is no use in studying the Vedas and other scriptures to acquire non-dual wisdom. That is why Bhagavan Buddha rejected the scriptures, and even Sage Sankara indicated that the ultimate truth lies beyond religion, the concept of god, and scriptures.

Therefore, there is no use in taking the strain to understand and assimilate the conceptual divisions invented by teachers of philosophy through their excessive analysis. There are more and more doubts and confusion if one tries to understand and assimilate the ultimate truth through the scriptures.

That is why Sage Sankara says: ~ What is accepted without a proper inquiry will not lead a person to the final goal. On the contrary, such acceptance will result only in evil, something which is detrimental to our spiritual progress.

Sage Goudpada: ~ To establish the truth of Non-duality by sheer reasoning alone. He begins by defining "What is real?" "What is unreal?" etc, because that is the right way to discuss or teach. People must first know what they are talking about. (Manduka Karika)

That is why Bhagavan Buddha said:-

Believe nothing because a wise man said it,

Believe nothing because it is generally held.

Believe nothing because it is written.

Believe nothing because it is said to be divine.

Believe nothing because someone else said it.

But believe only what you, yourself judge to be true

Swami Vivekananda said: - “You have to grow from the inside out. None can teach you, and none can make you spiritual. There is no other teacher but  the Soul.”

Katha Upanishad:~ This Atman cannot be attained by the study of the Vedas, or by intelligence, or by much hearing of sacred books. It is attained by him alone whom It chooses. To such a one Atman reveals Its own form. (Katha Upanishad Ch-II -23-P-20)

Mundaka Upanishad:~ This Atman cannot be attained through the study of the Vedas, nor through intelligence, nor through much learning. He who chooses Atman—by him alone is Atman attained. It is Atman that reveals to the seeker Its true nature. (3 –page-70 Mundaka Upanishad  Upanishads by Nikilanada)

Why follow the path of doubts and confusion by losing oneself in the labyrinths of philosophy, when one can realize the ultimate truth without them. 

By mentally tracing the source of the mind from where it rises and subsides one becomes aware of the fallacy of the mind, which rises as waking or dream and subsides as deep sleep. 

The mind arises from consciousness and subsides as consciousness. Therefore, there is a need for a perfect understanding of the assimilation of nondual truth.

There is no need to renounce worldly life to get Self-Realization. Any householder can attain it if has the inner urge.

Ashtavkra: - "The man of knowledge, though living like an ordinary man, is contrary to him and only those like him understand his state.:~Santthosh Kumaar