There were a lot of layers added on over the centuries. For example, being a bishop or presbyter in the first few centuries wasn’t a “job” as it later would become.
Perfecting and adapting its organization to fight the heresies of its time directly affected ministry because the efforts at centralizing authority inevitably capsize local authority. As mentioned above, the local authority, although certainly providing some governance, was primarily ministering the sacraments to the community. The idea of “office” now developed within the Church organization (Cooke 49). 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.
A second ministerial effect of centralizing authority is the creation of hierarchy. Presbyters, who worked alongside the bishops in joint care of their communities, had become by the end of the fifth century, the bishop’s assistant (Cooke 49). The rapid spread of Christianity into the countryside created the need for community leaders outside the cities where the bishop’s had established their sees. Losing their prior lateral relationship, the presbyters now reported to the bishop, becoming the permanent, but subordinate pastors of these rural churches.
A third ministerial effect flows from the “hierarchy” effect: the objectification of the laity. If members are not “official” (recognized somewhere in the hierarchical structure) then they are without authority. Having no active ministerial role to play in the institution, the “non-ordained” or laity, become the passive objects of the ordained. The laity, perforce, assume a passive role as the people “to be saved” in the church (Cooke 49).
Cooke, Bernard, Th.D. Church, Sacraments, and Ministry. The Loyola Institute for Ministry
Extension Program. New Orleans: Loyola U, 2003.