12 When the clergy is distinguished by these virtues, the people will profit in no small measure, since they love the Church, are very devoted to the ancestral religion, and easily and willingly submit to the directives of their pastors. - However you must never fail to make sure that the integrity of Catholic doctrine is preserved in the people and that Evangelical discipline is retained in their actions, life and character. Let frequent sacred retreats for the care of souls be undertaken. To direct this work, choose men of tried virtue, animated by the spirit of Christ, and inflamed with love of neighbor. - Well-written pamphlets to guard against errors or to extirpate them should be widely disseminated. They must be in accord with the truth and encourage virtue. Some societies have already taken up this laudable proposal, with fruitful results. We wish therefore that their number increase and that their success continue from day to day. - Another thing We wish all of you to do, but especially those of you who excel in learning, dignity, and authority, is that in both private and public life, you be solicitous for the good name of religion. Let the cause of the Church be more vigorously prosecuted under your leadership. Let all present and future institutions founded to promote the Catholic cause be willingly aided and increased. - In like manner you must oppose certain false opinions, perversely proposed to safeguard each one's dignity, but which are entirely contrary to the precepts and faith of Christian customs and which open the door to many pernicious and criminal acts. - Finally you must assiduously acid vehemently oppose improper organizations, particularly those which We have mentioned in our encyclicals to other places, whose contagion must be averted by every means. In this matter, We desire that you exercise care in proportion to their number, power, and resources.
Source: Quod Multum (Vatican.va)