Introduction

1. The Good Shepherd, the Lord Christ Jesus (cf. Jn 10: 11, 14), conferred on the bishops, the successors of the Apostles, and in a singular way on the bishop of Rome, the successor of Peter, the mission of making disciples in all nations and of preaching the Gospel to every creature. And so the Church was established, the people of God, and the task of its shepherds or pastors was indeed to be that service "which is called very expressively in Sacred Scripture a diaconia or ministry."

The main thrust of this service or diaconia is for more and more communion or fellowship to be generated in the whole body of the Church, and for this communion to thrive and produce good results. As the insight of the Second Vatican Council has taught us, we come, with the gentle prompting of the Holy Spirit, to see the meaning of the mystery of the Church in the manifold patterns within this communion: for the Spirit will guide "the Church in the way of all truth (cf. Jn 16:13) and [unify] her in communion and in the work of ministry, he bestows upon her varied hierarchic and charismatic gifts [...]. Constantly he renews her and leads her to perfect union with her Spouse." Wherefore, as the same Council affirms, "fully incorporated into the Church are those who, possessing the Spirit of Christ, accept all the means of salvation given to the Church together with her entire organization, and who — by the bonds constituted by the profession of faith, the sacraments, ecclesiastical government, and communion — are joined in the visible structure of the Church of Christ, who rules her through the Supreme Pontiff and the bishops."

Not only has this notion of communion been explained in the documents of the Second Vatican Council in general, especially in the Dogmatic Constitution on the Church, but it also received attention from the Fathers attending the 1985 and 1987 General Assemblies of the Synod of Bishops. Into this definition of the Church comes a convergence of the actual mystery of the Church, the orders or constituent elements of the messianic people of God, and the hierarchical constitution of the Church itself. To describe it all in one broad expression, we take the words of the Dogmatic Constitution Lumen gentium just mentioned and say that "the Church, in Christ, is in the nature of sacrament — a sign and instrument, that is, of communion with God and of unity among the whole of humankind." That is why this sacred communion thrives in the whole Church of Christ, as our predecessor Paul VI so well described it, "which lives and acts in the various Christian communities, namely, in the particular Churches dispersed throughout the whole world."