Neti Neti (Sanskrit : नेति नेति) is a Sanskrit expression which means "not this, not that", or "neither this, nor that" ( is sandhi from "not so"). It is found in the Upanishads and the Avadhuta Gita and constitutes an analytical meditation helping a person to understand the nature of the Brahman by negating everything that is not Brahman. One of the key elements of Jnana Yoga practice is often a "neti neti search." The purpose of the exercise is to negate all objects of consciousness, including thoughts and the mind, and to realize the non-dual awareness of reality. Neti neti, meaning, "Not this, not this", is the method of Vedic analysis of negation. It is a keynote of Vedic inquiry. With its aid the Jnani negates identification with all things of this world which is not the Atman, in this way he negates the Anatman (Not-Self). Through this gradual process he negates the mind and transcends all worldly experiences that are negated till nothing remains but the Self. He attains union with the Absolute by denying the body, name, form, intellect, senses and all limiting adjuncts and discovers what remains, the true "I" alone. L.C.Beckett in his book, Neti Neti, explains that this expression is an expression of something inexpressible, it expresses the ‘suchness’ (the essence) of that which it refers to when ‘no other definition applies to it’. Neti neti negates all descriptions about the Ultimate Reality but not the Reality itself. Intuitive interpretation of uncertainty principle can be expressed by "Neti neti" that annihilates ego and the world as non-self (Anatman), it annihilates our sense of self altogether. Adi Shankara was one of the foremost Advaita philosophers who advocated the neti-neti approach. In his commentary on Gaudapada’s Karika, he explains that Brahman is free from adjuncts and the function of neti neti is to remove the obstructions produced by ignorance. His disciple, Sureshvara, further explains that the negation, neti neti, does not have negation as its purpose, it purports identity.