Non-Duality is the next step of opening into Non-Dual realization beyond the duality of Energies, of good and bad feelings, Yin and Yang - meaning that most of the Polarities and dual energies have been worked through and Transcended. There is no more Doer-ship, it is abidance as Beingness, as I AM.

Compared to Presence, Non-Duality is even lighter and more expanded. The soul burns the heaviest karmic ties, and the biggest key conditionings are transcended. There is a feeling as if there is no one here anymore, just present Nothingness. No identity, no person, no particular position, only Being in the Present Space of Nothingness.

It is very relieving to know that the Mind is not needed anymore, that Personal I AM is not needed anymore either, thus there is no fixed position and Nothingness feels better. It is also much lighter than Presence, more detached from energies and polarities. A feeling of Liberation arises, thus it is called a Pre- Enlightenment phase.