A great way for me to leave the whole concepts of duality/nonduality behind and live in the "sense" of it is inner body awareness. Not just feeling the aliveness inside but realizing, with my own awareness, that my body is a sensor, a living organism. Feeling that---the awareness within, and also outside. No separation, no real boundary. My body as a pass through sensor. It receives all sorts of things from the outside and generates things from the inside which never stay for long (wind, sound, feelings, sensations, thoughts, movements, and so many things which have no words).
Sensing my inner body in this way, as the same as what is outside my body makes it feel as if my body is "of this earth," of the same stuff as yours and everything else in the universe. It is. But I am not talking about this as a belief that I hold just in my head. I mean to sense in my body the same aliveness that is outside of it. This whole thing or world as one. It's a sense, not a thought. The body comes alive in that way. It is truly felt as a living, breathing, alive organism at one with everything. It's in this way that I understand nonduality as well as Tolle's talks about intelligence as more than just the mindstuff.
I have a friend who uses the phrase "my body is an inquiry." Yes, that is it. The need to conclude, answer, know mentally, be someone kills this. When the body is felt as an alert sensor, an inquiry, I live in a state of asking, looking, feeling. It's all questioning without the need to know the answer. It is lightness. I can then look at a flower, water, another person, or furniture and realize, in terms of feeling, sensing, that all of this is one. The separation is purely mind made and self-serving. And yet my mind is fully functioning, in case I need it.
It's really not something that can be expressed very well, at least not by me.
"When people ask me who they are or who God is, I smile inside and whisper to the light: there you go again . . . pretending."