When I say, “Be spacious, allow what is happening out of a spacious attitude,” I don’t mean that you should deliberately try to create for yourself the sensation or the experience of spaciousness. That might or might not happen by itself, depending on what is there. What I mean is that you include whatever is happening in your awareness; you don’t resist it. If what is happening is resistance and thickness, then that is where you are. You can be at peace with thickness, allowing it to happen, letting it be as thick as it wants to be, feeling that thickness as much as possible. So inquiring into it means delving into it and experiencing it fully. The attitude with which you approach your experience is a lot more important than getting to any particular state of consciousness. – The Unfolding Now: Realizing Your True Nature through the Practice of Presence, Ch. 4
The emptiness of self reveals a deeper understanding of spaciousness, one that underlies experience in general. In other words, spaciousness unfolds from one kind to another until it becomes the emptiness of self, which is a manifestation of the other side of Being, also known as nonbeing. The spaciousness becomes so empty and so open that it is no longer spaciousness—it is simply nothing. So knowing the emptiness of self means recognizing not only that the constructs of the individual consciousness are not reality but also that the individual consciousness itself does not exist. – Runaway Realization: Living a Life of Ceaseless Discovery, Ch. 12