10 Furthermore, since these departments are established for the good of the universal Church, it is desirable that their members, officials, and consultors as well as legates of the Roman pontiff be more widely taken from various regions of the Church, insofar as it is possible. In such a way the offices and central organs of the Catholic Church will exhibit a truly universal character. It is also desired that some bishops, too-especially diocesan bishops-will be chosen as members of the departments, for they will be able to report more fully to the supreme pontiff the thinking, the desires, and the needs of all the churches. Finally, the fathers of the council think it would be most advantageous if these same departments would listen more attentively to laymen who are outstanding for their virtue, knowledge, and experience. In such a way they will have an appropriate share in Church affairs.
Source: Christus Dominus (Vatican.va)