I understand your question. In A Thousand Names for Joy and in a lengthy interview with John Parker, Byron Katie describes what she calls a life-changing realization.

Parker: You said that nothing exists…. It’s all an illusion. 

Katie: Exactly.

Parker: …the world and the cosmos disappear.

Katie: It doesn’t exist to disappear.

Parker: What replaces it?

Katie: Nothing, nothing.

Parker: That which is not present in deep dreamless sleep is not real.

Katie: Of course it’s not real. It’s nothing…the ‘I’ is the origin of the whole universe.

The Self-realized person answers the first question concerning the inquiring ‘I’: Is it true? Is there an I?