Many there are who do not even hear of Atman; though hearing of Him, many do not comprehend. Wonderful is the expounder and rare the hearer; rare indeed is the experiencer of Atman taught by an able preceptor.
Yajur Veda, Katha Upanishad, Part One, Chapter II, 7
Atman, when taught by an inferior person, is not easily comprehended, because It is diversely regarded by disputants. But when It is taught by him who has become one with Atman, there can remain no more doubt about It. Atman is subtler than the subtlestand not to be known through argument.
Yajur Veda, Katha Upanishad, Part One, Chapter II, 8
This Knowledge cannot be attained by reasoning. Atman become easy of comprehension, O dearest, when taught by another. You have attained this Knowledge now. You are, indeed, a man of true resolve. May we always have an inquirer like you!
Yajur Veda, Katha Upanishad, Part One, Chapter II, 9
The fulfilment of desires, the foundation of the universe, the rewards of sacrifices, the shore where there is no fear, that which adorable and great, the wide abode and the goal-all this you have seen; and being wise, you have with firm resolve discarded everything.
Yajur Veda, Katha Upanishad, Part One, Chapter II, 11
Agni blazes and flashes from the height of heaven. To the God Agni belong all airy spaces, Agni it is whom mortal men enkindle, conveyer of offerings, lover of the clarified butter.
Atharva Veda XII, 1, 20
