Neti neti
Neti Neti (Sanskrit : नेति नेति) is a Sanskrit expression which means "not this, not that", or "neither this, nor that" (neti is sandhi from na iti "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 Brahman by negating everything that is not Brahman.