Deacons are members of one of three distinct orders of ordained ministry (with bishops and presbyters). In the Episcopal Church a deacon exercises "a special ministry of servanthood" directly under the deacon's bishop, serving all people and especially those in need (BCP, p. 543). This definition reflects the practice of the early church, in which deacons were ordained "not to the priesthood but to the servanthood [diakonia, "ministry"] of the bishop" (Hippolytus, Apostolic Tradition). In the ancient Greek-speaking world the term diakonos meant an intermediary who acted or spoke for a superior. Christian deacons were agents of the bishop, often with oversight of charity. Since ancient times the liturgical functions of deacons have suggested the activity of angels. As they proclaim the gospel, lead intercessions, wait at the eucharistic table, and direct the order of the assembly, deacons act as sacred messengers, agents, and attendants. The revival of the order of deacons in the twentieth century has emphasized social care and service. Many bishops in the Episcopal Church expect their deacons to promote care of the needy outside the church. In addition to those ordained deacon as a permanent vocation, there are also "transitional deacons" who are ordained deacon as a preliminary step toward ordination as a priest. This practice is required by the canons of the Episcopal Church, but its theology and usefulness has been questioned by those who favor direct ordination to the order for which one is chosen. See Direct Ordination.