We're stuck evaluating and analyzing the body-mind and it's relation to the world, as if this "thing" we've taken ourselves to be is a separate thing and a "special" entity, as if liberation were something this body-mind can attain in the future. All attempts to gain knowledge and wisdom lead us to a dead end.
The world and this body-mind is a bundle of passing images, a play of "formed emptiness". It comes and it goes - nothing is guaranteed, nothing is permanent.
Yet there is a knowing of this which is never touched, never changes. All we can say is that we are only the awareness/consciousness in which these passing, impermanent images appear. This is evident in direct experience and quite obvious if the identification with this "appearance" is questioned.
But awareness is still a concept - still formed from nothingness, made of the same "substance".
So the awareness/consciousness and the passing world are both the same nothingness, formed from the same emptiness. Any knowledge, any words or concepts formed or gained, is part of this play of nothingness, has no absolute meaning apart from the dream of appearance in which it appears.
Where can we stand and point to what we are? What can we take hold of and claim - "Here I AM"! What knowledge can stand up to and apart from the vast emptiness and claim ownership, doership, choice, free-will, suffering or happiness? We're running out of room, out of concepts on which to hang our search, out of ground upon which to stand... we're approaching the very edge of being and not being, the cliff of knowing and not-knowing.
We're left with no concepts to grasp, no ownership to claim, no identification to take, no consciousness in which the world appears, and no world at all to appear. All words used to describe what we are, all concepts found to justify our existence or give meaning to this appearance are seen as part of the very nothingness which creates the illusion.
As we fall off the cliff of beingness, we find no direction to fall, no ground to hit, and no body to die. We find there never was a cliff at all from which to fall.
Advaita says that self-knowledge gets rid of self-ignorance. We find that self-knowledge is the complete and total annihilation of knowledge as relevant to what I am. We find that even the concept of beingness itself, the concept of knowing what I am, is meaningless.
This is the Peace of "not-knowing".