6 Now the religious associations whose members, in the judgment of prudent men(to which the experience of all time testifies) have fulfilled this ministry ofsalvation no less gladly than laboriously, will be able to supply many menburning with holy zeal. For the rule and discipline of the societies to whichthey belong, as well as the virtue of each trained in constant exercise, islikeliest to produce men efficient before all others for such work as this.
Source: Pastoralis Vigilantiae (Vatican.va)