Abstract
Intrinsic and essential nature of Brahman, as Light luminous-in-self of Witness Consciousness requires a radically apophatic discourse. Brahman is Ātman, the inner Self, of all beings, is uniform, nondual, unchangeable, Ultimate Reality which cannot be objectified in any way, since It is the unseen seer, the unthinkable thinker, the unknown knower. The Upanishads require the unique method of excluding all empirical modes of teaching or knowledge about Brahman. And, this method shows Brahman revealed by itself, by simply removing the imaginary veil of wrong thinking, constructed by projecting limiting adjuncts of ignorance. Brahman, as the inner Self, needs no definition or evidence to be known. Really speaking, it is impossible for anyone „to define” in words or „to formulate” an idea about Brahman, for the simple reason that It is beyond to discursive thought. Brahman, Ultimate Reality, is non-dual light, pure Consciousness as intuitive experience, through which all human activities are performed. Just in this spectrum of non-dual experience, must be understood the negation neti, neti in Sankara`s thought: far from being a mere exercise of philosophical dexterity, via negativa has a practical application, experiential in knowledge of Ultimate Reality.