6 Consequently, be sure that you diligently do all that you can so that priests and laity understand exactly what they are allowed to do and what they must beware of lest they offend the precepts of natural and divine law. As the majority of you who have pastoral responsibility gave orders to await the judgment of the Holy See on these matters, it will be your urgent duty to exhort the same ministers of the sacred mysteries to consider it their religious duty not to depart in the least degree from the decision or regulations of the Holy See. It goes without saying, moreover, that what is forbidden for the clergy is by no means permitted the laity.
Source: Constanti Hungarorum (Vatican.va)