The Father, Son, and Spirit are considered "existential" persons of Deity, those in existence from the eternal past to the eternal future. In addition, three persons of Deity are described who are "experiential," or incomplete and in the process of actualizing: God the Supreme; God the Ultimate; and God the Absolute. Of these three, God the Supreme, or "the Supreme Being," is given the most explanation, as the person of Deity evolving in time and space to unify finite reality and the infinite. The persons of God the Ultimate and God the Absolute are considered to be remote from the possibility of comprehension and are covered on a limited basis.