During the current period of manifestation these various grades of beings are working to acquire more experience than they possessed at the beginning of this period of existence. Those who, in previous manifestations, have attained to the highest degree of development work on those who have not yet evolved any consciousness. In the Solar system, God's Habitation, there are seven Worlds differentiated by God, within Himself, one after another. Mankind's evolutionary scheme is slowly carried through five of these Worlds in seven great Periods of manifestation, during which the evolving virgin spirit becomes first human and, then, a God.