philosophy
What is neti neti and what does it teach about knowing Brahman?
What the words mean
Neti neti comes from two Sanskrit words joined together: na iti, which means "not so" or "not this." Said twice, it becomes a method. When the mind tries to grasp Brahman by saying it is this thing or that thing, the teaching answers, "not this, not this." Every idea, image, name, or quality the mind offers is gently set aside, because Brahman is held to be beyond all of them.
Where it comes from
This way of speaking appears in Upanishadic thought, in the teachings linked to the sage Yajnavalkya. There, Brahman is described by saying what it is not, rather than by listing what it is. The idea is that words and concepts come from the world of things, so they can never fully hold something that is beyond all things. Later, this approach became central to the Advaita school, which leans on it heavily.
Why describe by denial
The deeper point is simple. Anything you can name, picture, or measure is a limited thing. Brahman, in this view, is not one more object among objects. So every description you reach for falls short. By saying "not this" to each idea, the seeker clears away the smaller things the mind clings to. What is left is not another concept, but a pointing beyond all concepts. It is a bit like clearing clouds rather than painting the sky.
How it is used
In the path of knowledge, called jnana yoga, neti neti is used as a quiet practice of inquiry. A person watches the body, the breath, the thoughts, and the feelings, and notes that each one can be observed, so each one is "not this," not the true self that is doing the watching. By letting go of what can be set aside, the practice tries to turn attention toward what cannot. Different teachers explain the goal in different ways, and it is one method among several within the tradition.