This is the model of maturity levels. God uses maturity levels in people as His distribution system for life-giving nourishment of His body, quite like our blood distribution system in our own bodies. The volume of life-water flowing through us to others is directly related to our level of maturity. The life springs from our hearts and the capacity of our hearts to impart life is our maturity and joy capacity.
Life pours from God through four main outlets – four faces – then through elders, then parents, down through adults and into children and infants.