Katha Rudra Upanishad Teachings

That spontaneous flash of illumination (realization of nature of the Atman as a result of the pure knowledge arising out of the power of Brahmacharya) that irradiates the world is ever shining. It is indeed the witness of the world, the universal Self, embodiment of purity, substratum of all beings, of the very nature of absolute consciousness through and through.

Neither by work nor through progeny nor by any other means whatsoever, but only by intuitive awareness of Brahman does a person attain Brahman.

That Brahman which is the object of real or supreme Knowledge, is Truth, awareness, Joy (Bliss) and non-dual (One without a second).

He who realizes the inner Self as ‘I am Brahman’, he becomes Brahman Itself.
Katha Rudra Upanishad