Brahma –Jnana :
The supreme Reality is indescribable. It is beyond the reach of the mind and the senses. It is beyond even the Intellect .It is the light of all else, nothing is a light to it. Speech cannot express it .Mind cannot think it. Intellect cannot understand it. Senses cannot perceive it. Such a wonderful being is the Truth .Brahma-Jnana is not knowledge of something but becoming Absolute Knowledge itself. It is the Infinite Subject if speech can be permitted to express like that .It is an experience and not a perception. It is absoluteness and is therefore, beyond the concept of duality and pairs of opposites. The greatest blessedness is to know That, and he is an unfortunate man who dies without the knowledge of it.
(Source : A book called Upanishad Sara published in 1947.The contents are completely from that book )