The central issue of the Kingdom of God is that of being born again. Two separate races are involved in the Divine plan of redemption. Two kinds of creatures must be taken into account if we would understand what God is doing. The first race is from Adam. The second race is from Christ.
Christ is the beginning, the firstborn from the dead of a new race. The new race consists of life-giving spirits who have souls fashioned in the image of the Soul of God their Father. The first race is temporary and its environment is temporary. The second race is eternal and its environment is eternal.
