Epistemologically, the formation of axiomatic concepts is an act of
abstraction, a selective focusing on and mental isolation of metaphysical
fundamentals; but metaphysically, it is an act of integration—the widest
integration possible to man: it unites and embraces the total of his
experience.
The units of the concepts “existence” and “identity” are every entity,
attribute, action, event or phenomenon (including consciousness) that exists,
has ever existed or will ever exist. The units of the concept “consciousness”
are every state or process of awareness that one experiences, has ever
experienced or will ever experience (as well as similar units, a similar
faculty, which one infers in other living entities).