nAyam Atma pravacanEna labhyah
na mEdhayA na SrutEna |
yamEvaisha vrNuttE tEna labhyah

KaThopanishad 2-2-23

The supreme self can never be attained through discourses, nor by intellect,nor by hearing. Only whom He chooses, by him alone can He be attained.The Vedas are called apourusheya, not composed by anyone but have eternalexistence being part of the Lord. They, in spite of being the only sourceof knowledge about Parabrahman, are not able to describe Him