6 As legitimate successors of the Apostles and members of the episcopal college, bishops should realize that they are bound together and should manifest a concern for all the churches. For by divine institution and the rule of the apostolic office each one together with all the other bishops is responsible for the Church. They should especially be concerned about those parts of the world where the word of God has not yet been proclaimed or where the faithful, particularly because of the small number of priests, are in danger of departing from the precepts of the Christian life, and even of losing the faith itself. Let bishops, therefore, make every effort to have the faithful actively support and promote works of evangelization and the apostolate. Let them strive, moreover, to see to it that suitable sacred ministers as well as auxiliaries, both religious and lay, be prepared for the missions and other areas suffering from a lack of clergy. They should also see to it, as much as possible, that some of their own priests go to the above-mentioned missions or dioceses to exercise the sacred ministry there either permanently or for a set period of time. Bishops should also be mindful, in administering ecclesiastical property, of the needs not only of their own dioceses but also of the other particular churches, for they are also a part of the one Church of Christ. Finally, they should direct their attention, according to their means, to the relief of disasters by which other dioceses and regions are affected.
Source: Christus Dominus (Vatican.va)