The core of one’s existence is ever empty and is untouched by duality /illusion; it is the source of the mind from where the mind rises and subsides and it is ultimate reality, it belongs entirely to itself, which is never part of the unreality.
It is like a pure diamond blazing with the invisible light. It is in everything and everywhere in the three states, and if one could observe it mentally, he would grasp the truth all the diversity/illusion caused by ignorance vanishes completely.
An important part of pursuit of truth is being receptive to receive the truth. Some find it easier to be receptive, and some find it hard because they want everything to be within the scope of their preconceived ideas.
When one is receptive he does not barricade himself to fresh flow of knowledge derived from deeper thinking. He does not try to defend himself on his accumulated ideas, but he is open to the mystery by inquiring what he believes in.
When one is not trying to find himself within some particular concept or feeling, then the receptiveness expands until his true identity becomes more and more the clearer, rather than sticking to some belief or a particular feeling in the physical body. It is not to get rid of thoughts or feelings or experience, but just not to feel located inside of them.