Kena Upanishad (5) Chapter II :~ If a man knows Atman here, he then attains the true goal of life. If he does not know It here, a great destruction awaits him. Having realized the Self in every being, the wise relinquish the world and become immortal.
Most thinkers’ point of view of non-duality is based on the physical self or ego or the waking entity. The thinker and the thoughts are part of the illusory duality. The individual experiences are happening within the waking experience. The waking experience itself is a mirage created out of the formless consciousness, which is the innermost self. The ego/physical self and the world are part of the mirage. The ego is the false self within the false experience. Thus, the individual experiences within the waking experiences are mere mirage. Thus, the experience of the birth, life and death are part of the mirage.
If someone kills someone within the waking experience is as good as killing is taking place in the dream. The killer and killing and the world are one in essence. Until the ignorance is there the waking experience prevails as reality. Only when wisdom dawns the waking experience becomes unreal. The man who believes himself as a person born in this world and the world existed prior to him will not be able to assimilate self-knowledge because he is unaware of the fact that, he is part and parcel of the waking experience, which is illusory reality. Thus, his understanding is limited to form, time and space. The form, time and space are one in essence.
The formless witness of the three states is not the physical self or waking entity or ego, but the formless soul, which is in the form of consciousness. On the standpoint of the soul as self, the three states are unreal. Thus, if someone kills someone, is a reality, within the waking experience. But waking experience itself is unreal. The unreal appears and disappears as three states. The witness of the three states is unaffected and apart. To realize this truth it takes quiet a lot of mental effort. A proper and perfect understanding in this regard leads the seeking mind, towards non dual reality. The one who is able to grasp this truth is a Gnani.