The Christian search for oneness with God is, I believe, at the basis of all which St Ignatius wrote, for what is ONE in heaven, is MANY in this world; but the many do not have to be utterly separated from God. Rather, they can be brought into relation through a hierarchy, a holy rule or state of being. This is where the unity of the Church and its hierarchy comes in: the Church, bishops, priests and deacons mediate between the ONE and the MANY. They share in the characteristics of both.