Neti Neti
Means Not this Not this in English.
Method of regression to understand and apply for a more spiritual understanding of Life.
A method of inquiry that means negating everything until you realize the ultimate truth, an idea practiced and preached by Indian saints and philosophers.
I hope you are good enough to know more from the Internet, Below is just one of the references.
http://stephenhwolinskyphdlibrary.com/downloads/The%20Zen%20of%20Advaita.pdf
Here below is one video that discusses the topic of Neti Neti.
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