Early Christianity developed a visible human organization, known as clergy, primarily to administer the sacraments. These successors to the twelve apostles came to be called bishops and, under their leadership, the Church grew organically for the first four centuries. Bishops and their helpers, presbyters and deacons, instructed and baptized the catechumens bringing them into the community. The new members in time catechized others and the movement grew at a natural geometric rate. Theodosius’ action, however, accelerated Christianity’s growth rate (being Christian now had positive political consequences; not being Christian, negative consequences) beyond the organization’s ability to indoctrinate newcomers in the ordinary way. As a result, new members were poorly formed in the faith, and heresies resulted. The Church, to protect its unity, responded by centralizing its authority. Ecumenical in their formation, but central in their governance, the early councils prototyped the preferred method, the conciliar method, for resolving attacks on the oneness of the Church. This new ecclesiology for projecting its authority emphasized the institutional model of Church and mimicked the political structure of the time, centralized Roman governance.
The idea of “office” now developed within the Church organization. The local churches had designated their ministers based upon the needs of the community and the gifts, or charisms, of individuals in the community. Therefore, the Holy Spirit, the source of all charisms, provided the community with ministers (the bishop and his deacons) to teach, heal and govern as needed. A new notion of “office,” while not totally displacing the Holy Spirit as the ultimate source of charism, instigated a process of ordination as an intermediate and necessary step to the empowerment of those in pastoral care. By virtue of ordination, the individual became endowed with the authority and responsibility of the pastoral office. Teachers, healers and rulers who were, heretofore, acknowledged by local acclamation, now required official proclamation and that proclamation was no longer local, but from afar.