Anything that is comprehended can only be comprehended in relation to an absolute, even if that absolute be the belief that there is no absolute, limiting as that is to comprehending all phenomena. All philosophy is the search for the true absolute against which all is measured. Once found, all thought orbits the reality of the absolute that is not a concept, and not an experience, but is that upon which concepts and principles form. The absolute is not life, for life only exists in the realm of dualism. Indeed, existence itself only is, in the realm of dualism. The absolute is found in non-dualism, a holistic awareness also described as non-differentiation that encompasses and enfold differentiation.
This is where language begins to breakdown in its logical descriptive service to communication. For, in order for awareness to exist, then relationship must exist, and existence implies two. Awareness of another is the dualistic reality of differentiation defined by the perceptual capacities of various biological forms required for survival of an organism.
Naturally the question arises, since perceptual differentiation as dualism is the reality which causes interacting humans to continue existing long enough to perpetuate the species, what is the nature of non-differentiated reality? In Buddhism, it is called emptiness and understanding of emptiness can be conceptually approached through the simple intellectual process of failed self-identification. The experience of emptiness is not an experience, for experience requires two, as does any concept.
The functionality of imagined concepts such as nothingness, as descriptions of reality, logically breaks down. What is known of reality can only be conceptually described via the limitations of intellectual communication because existence only is, within relationship. Yet, because awareness does exist as emptiness without an object, and does not require relationship with a thought or thing, then awareness without object is that which does not change, i.e. emptiness, which cannot be imagined but can only be non-experienced (given the limiting dualistic requirement of relationship that defines experience). All that we perceive, thoughts and things, comes from emptiness and returns to the emptiness that is the undifferentiated all, which cannot exist as defined by the constraints of dualism, and yet does exist.