12 Concerning the founding and directing of newspapers and periodicals, the clergy must faithfully follow Article 42 of the Apostolic Constitution Officiorum , namely, "Clerics are forbidden to direct newspapers or periodicals without the previous consent of the Ordinaries." Similarly, without the previous consent of the Ordinary, no cleric can publish any kind of writing, be it concerned with a religious, moral, or merely technical subject. Before the founding of circles and societies their rules and constitutions must be examined and approved by the Ordinary. No priest or cleric can lecture on Popular Christian Action or any other subject without the permission of the Ordinary of the place. Language which might inspire aversion for the higher classes is, and can only be regarded as, altogether contrary to the true spirit of Christian charity. Likewise, all terms smacking of an unhealthy novelty in Catholic publications are condemnable, such as those deriding the piety of the faithful, or pointing out a new orientation of the Christian life, new directions of the Church, new aspirations of the modern soul, a new social vocation of the clergy , or a new Christian civilization.
Source: Pieni L'Animo (Vatican.va)