5 These matters concern the proper upbringing and application of the clergy to the sacred ministry. But the needs of the faithful demand your efforts no less. In their regard, what has precedence is that children and ignorant people are properly to be taught the elements of our most holy religion; this calls for the unremitting diligence of the pastors. Then, where it is publicly permitted, instruction is to be organized for youth so that they will not be compelled to frequent the athletic facilities of heretics or attend schools where Catholic discipline is not mentioned unless to be calumniously derided, and this to the great detriment of faith and good morals. - Besides, since minds are strengthened and stimulated by counsel and reciprocal example to do and suffer great things for religion, you will merit well on that account if you encourage and persuade laymen, especially the young, to join Christian societies. We have frequently praised them in exhortations as institutions that strive to care for the needs of religion and improve the advantages of the poor; at the same time, they diminish the appeal of those associations that abuse the title of public charity, since they are very much opposed to the welfare of Church and State.-Also do not fail to realize how much influence for good and evil, especially in these our times, magazines and similar popular writings have acquired. Use these weapons in defense of the Christian name, with the leadership of the episcopate properly preserved and with all respect due the civil power. Finally all Catholics should remember that it is of the greatest concern to the Church what kind of men are elected to the legislature. Thus, preserving the rights of civil law, everyone must strive to elect those who join zeal for religion to their zeal for public affairs. This will come about more readily if each individual obeys the supreme authority governing the state and if everyone continuously advocates those things We have published not long ago in encyclical letters concerning the Christian constitution of the state.
Source: Litteras a Vobis (Vatican.va)