And the intellect is only a form of judgment that is passed on this organised knowledge of the mind. So, the intellect, the mind and the senses seem to be of a common group. They belong to the same category. With these untrustworthy servants of knowledge, which we have employed for our knowledge, we cannot really know Truth. This is why the Katha Upanishad warns us that by sheer argument, study, intellectuality and rationality, Truth cannot be known.
Truth has to be known by one with the blessing of a special type of instrument.
No commentator has been able to properly explain what this term, Ananya-prokte , in the Upanishad, actually means. Many of the words used in the Upanishad are cryptic. They are like difficult nuts which you cannot easily crack. Ananya , grammatically, means other than what is already there , or different from what is there , or non-difference . This word occurs also in the Bhagavadgita, and even there the commentators vary in the interpretation of what it really signifies.