55 But of what avail, Venerable Brethren, will be all Our commands and prescriptions if they be not dutifully and firmly carried out? And, in order that this may be done, it has seemed expedient to Us to extend to all dioceses the regulations laid down with great wisdom many years ago by the Bishops of Umbria for theirs. "In order," they say, "to extirpate the errors already propagated and to prevent their further diffusion, and to remove those teachers of impiety through whom the pernicious effects of such dif fusion are being perpetuated, this sacred Assembly, following the example of St. Charles Borromeo, has decided to establish in each of the dioceses a Council consisting of approved members of both branches of the clergy, which shall be charged the task of noting the existence of errors and the devices by which new ones are introduced and propagated, and to inform the Bishop of the whole so that he may take counsel with them as to the best means for nipping the evil in the bud and preventing it spreading for the ruin of souls or, worse still, gaining strength and growth" (Acts of the Congress of the Bishops of Umbria, Nov. 1849, tit 2, art. 6). We decree, therefore, that in every diocese a council of this kind, which We are pleased to name "the Council of Vigilance," be instituted without delay. The priests called to form part in it shall be chosen somewhat after the manner above prescribed for the Censors, and they shall meet every two months on an appointed day under the presidency of the Bishop. They shall be bound to secrecy as to their deliberations and decisions, and their function shall be as follows: They shall watch most carefully for every trace and sign of Modernism both in publications and in teaching, and, to preserve from it the clergy and the young, they shall take all prudent, prompt and efficacious measures. Let them combat novelties of words remembering the admonitions of Leo XIII. (Instruct. S.C. NN. EE. EE., 27 Jan., 1902): It is impossible to approve in Catholic publications of a style inspired by unsound novelty which seems to deride the piety of the faithful and dwells on the introduction of a new order of Christian life, on new directions of the Church, on new aspirations of the modern soul, on a new vocation of the clergy, on a new Christian civilisation . Language of this kind is not to be tolerated either in books or from chairs of learning. The Councils must not neglect the books treating of the pious traditions of different places or of sacred relics. Let them not permit such questions to be discussed in periodicals destined to stimulate piety, neither with expressions savouring of mockery or contempt, nor by dogmatic pronouncements, especially when, as is often the case, what is stated as a certainty either does not pass the limits of probability or is merely based on prejudiced opinion. Concerning sacred relics, let this be the rule: When Bishops, who alone are judges in such matters, know for certain the a relic is not genuine, let them remove it at once from the veneration of the faithful; if the authentications of a relic happen to have been lost through civil disturbances, or in any other way, let it not be exposed for public veneration until the Bishop has verified it. The argument of prescription or well-founded presumption is to have weight only when devotion to a relic is commendable by reason of its antiquity, according to the sense of the Decree issued in 1896 by the Congregation of Indulgences and Sacred Relics: Ancient relics are to retain the veneration they have always enjoyed except when in individual instances there are clear arguments that they are false or suppositions . In passing judgment on pious traditions be it always borne in mind that in this matter the Church uses the greatest prudence, and that she does not allow traditions of this kind to be narrated in books except with the utmost caution and with the insertion of the declaration imposed by Urban VIII, and even then she does not guarantee the truth of the fact narrated; she simply does but forbid belief in things for which human arguments are not wanting. On this matter the Sacred Congregation of Rites, thirty years ago, decreed as follows: These apparitions and revelations have neither been approved nor condemned by the Holy See, which has simply allowed that they be believed on purely human faith, on the tradition which they relate, corroborated by testimonies and documents worthy of credence (Decree, May 2, 1877). Anybody who follows this rule has no cause for fear. For the devotion based on any apparition, in as far as it regards the fact itself, that is to say in as far as it is relative , always implies the hypothesis of the truth of the fact; while in as far as it is absolute, it must always be based on the truth, seeing that its object is the persons of the saints who are honoured. The same is true of relics. Finally, We entrust to the Councils of Vigilance the duty of overlooking assiduously and diligently social institutions as well as writings on social questions so that they may harbour no trace of Modernism, but obey the prescriptions of the Roman Pontiffs.
Source: Pascendi Dominici Gregis (Vatican.va)