Not this, not this. The Brihadaranyaka Upanishad offers what may be the most honest description of ultimate reality ever formulated — by refusing to describe it at all.
Neti neti — neither this nor that — is the method of negation used in Jnana yoga to approach the nature of Brahman. Every description we apply to reality is incomplete. Every concept falls short.
So the teacher says: Brahman is not the body. Neti. Not the mind. Neti. Not thoughts, not feelings, not even consciousness as we ordinarily understand it. Strip away every layer of what you are not. What remains?
When you have negated everything that can be negated, what remains cannot be negated. That remainder is what you are.
Neti neti is not nihilism. It is the clearing of the space in which the real can be recognised — not as a new object added to experience, but as the ground of all experience that was always already present.