Aham Brahmaasmi Foundation®
“Only the Guru who is the knower of the Tattva (highest spiritual truth) can dispel our ignorance and bless us with Jnana. Bhagawan says in the Gita that the disciple should seek refuge in the self-realized Guru, serve Him, earn His grace and thereby obtain Jnana. You must seek refuge in such a Guru who is a knower of Brahman. You can say “I read the Upanishads by myself. I understand everything.” You may understand everything, but it will have no effect. Thus the Guru who can grant us Jnana is venerable and worthy of our worship and respect. This must be the attitude that the disciple must possess.
An Acharya is defined as one who knows the import of the Shastras, adheres to the Shastras Himself and inspires others to follow the Shastras. That is why the Upanishads talk about instances of disciples going to the Guru. In the Prashnopanishad, six disciples went to Sri Pippalada and put forth their questions and the Guru instructed his disciples. In the Mundakopanishad, Sri Shaunaka sought Sri Angirasa. All these indicate that spiritual instruction can be obtained only from the Guru. Knowledge that dawns as a result of the instruction of the Guru is alone fruitful.”
– Golden words of Jagadguru Sri Mahasannidhanam from https://books.sringeri.net/products/the-gita-reveals