25 Bishops, pastors of parishes, and other priests of both branches of the clergy should keep in mind that the right and duty to exercise this apostolate is common to all the faithful, both clergy and laity, and that the laity also have their own roles in building up the Church. For this reason they should work fraternally with the laity in and for the Church and take special care of the lay persons in these apostolic works. Special care should be taken to select priests who are capable of promoting particular forms of the apostolate of the laity and are properly trained. Those who are engaged in this ministry represent the hierarchy in their pastoral activity by virtue of the mission they receive from the hierarchy. Always adhering faithfully to the spirit and teaching of the Church, they should promote proper relations been laity and hierarchy. They should devote themselves to nourishing the spiritual life and an apostolic attitude in the Catholic societies entrusted to them; they should contribute their wise counsel to the apostolic activity of these associations and promote their undertakings. Through continuous dialogue with the laity, these priests should carefully investigate which forms make apostolic activity more fruitful. They should promote the spirit of unity within the association as well as between it and others. Finally, in keeping with the spirit and norms of their societies, Religious Brothers and Sisters should value the apostolic works of the laity and willingly devote themselves to promoting lay enterprises. They should also strive to support, uphold, and fulfill priestly functions.
Source: Apostolicam Actuositatem (Vatican.va)