Leaving the Duality means leaving the White and Black and stepping into the Wholeness which is beyond the energies of Ying and Yang. In Non-Duality we can perceive the whole picture, seeing through the dual nature of reality.
Mindo is speaking on Self-Inquiry as a method to reaching pure Consciousness and stabilizing in it. By negating of who you are Not, you come to your True Self, to a point of realization of the absolute Self.
One of the key differences of the Spiritual Teachers and ordinary people is that the Spiritual Teachers have their Third Eye and Crown Chakras very open. That allows for the Universal Wisdom to flow through. The most important Chakras for the Masters are the Heart, Throat, the Third Eye and Crown Chakra and they should be at least 60% wide open. Most of the people have these energy centers open only 5-10-20 in some cases 30%.
Mind O. Damalis speaks about the 4 steps of Forgiveness that begins with Accepting the situation as it is or was in the past. That leads to the next step of Forgiveness. After true Forgiveness, the energy is released and it brings the wisdom of the lessons of that cycle. Finally we become free to make changes in our life and within, the cycle thus was completed.