All Gurus and yogis consider themselves as holy people. That is why Sage Sri, Sankara says a Gnani "bears no outward mark of a holy man because they identify themselves with their body with the name.+.

A Gnani considers the Self is not his body but the Self is the Soul, which is present in the form of consciousness. 

For a Gnani,  his body is not the body but he considers it as consciousness.

For a Gnani,  his ego is not the body but he considers it as consciousness.

For a Gnani,   the world in which he exists is not the world but he considers it as consciousness.

All Gurus and yogis consider themselves as holy people. That is why   Sage Sankara says a Gnani "bears no outward mark of a holy man because they identify themselves with their body with the name. 

The one who identifies himself as swami, Guru, or yogi is not a Gnani. A Gnani never identifies himself as swami, Guru, pundit, or yogi. Swami, Guru, pundit, or yogi belongs to the religious and yogic path, not to the path of truth or wisdom.  

Sage Sankara: ~ "Though I wear these robes of a Sanyasin, it is only for the sake of bread."

Sage Sankara: ~ A Gnani "bears no outward mark of a holy man" (Stanza 539).

Thus, it proves that religious Gurus and yogis are not Gnanis because they identified themselves as holy people. 

A Gnani never claims himself as a Gnani, he guides the seekers, not posing himself as a Guru, and he does not force his wisdom on others.

Advaita is not a theory or a philosophy. Advaita is the nature of the Soul the innermost Self.  There is no need for any theory or philosophy or scriptures to acquire Self-knowledge. Only a perfect understanding of ‘what is what’ is needed.

Sage Sankara:~ 'Like a servant who carries a lamp in front of you to find your way, and you have found it, so becomes the Veda to that person. What is the Veda? ~ utterances of those who have known the Truth. Here is one who has known the Truth; why should he or she depend upon the Veda further? Actual realization takes you beyond books. At a certain stage, books become a botheration. The Upanishad itself says that the 'words are only so much of distraction for such minds'

Bhagavan Buddha: ~ Do not believe in anything merely on the authority of your teachers and elders.

You need not become a Guru or a monk to acquire Self-knowledge or Brahma Gnana or Atma Gnana. You have not to renounce the world or to leave anything ~ your wife, children, job, responsibilities. You do not have to renounce anything! The only thing you have to realize the truth, which is beyond the form, time, and space by realizing the form, time, and space is the product of ignorance. When the ignorance vanishes, the unreality of the form, time, and space is exposed.

Upanishad 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: ~ 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. (18: 89) : ~ Santthosh Kumaar