Upanishads say:~ "He who thinks he knows, does not know."+

Upanishads say:~ "He who thinks he knows, does not know." This means that to know anything implies a second, an object of knowledge, hence duality, i.e. no Gnana.

Tripura Rahasya, 18: 89:~ Second-hand knowledge of the Self-gathered from books or Gurus can never emancipate a man until its truth is rightly investigated and applied; only direct realization will do that. Realize yourself, turning the mind inward.

The pursuit of truth is a mental (inner) journey. Deeper Self-search makes one aware of ‘what truth’ is and ‘what is untruth’ and the subconscious will be able to reject the untruth after knowing, what is Truth. Whatever prevails after rejecting the untruth is the ultimate truth or Brahman.

Remember:~

The one who says he is already enlightened is ignorant.

The person who says I am enlightened is unaware of the fact that ‘Self’ is not he, because he and his experience of the world are the product of ignorance.

Only ignorant says he is already enlightened. Without the Advaitic wisdom, ignorance will not vanish.

The one which says ‘I am enlightened’ itself is the ego. The one which feels it is he or she is also the ego.

The ego is the false ‘Self’ (you or waking entity) within the false experience (waking).

The ego, body, and the world appear together and disappear together.

It is a foolish venture to try to destroy the ego because the ego is the very basis of the physical existence (universe in, which we exist). : ~ Santthosh Kumaar