91 Worthy of all praise and encouragement therefore are those educational associations which have for their object to point out to parents and educators, by means of suitable books and periodicals, the dangers to morals and religion that are often cunningly disguised in books and theatrical representations. In their spirit of zeal for the souls of the young, they endeavor at the same time to circulate good literature and to promote plays that are really instructive, going so far as to put up at the cost of great sacrifices, theaters and cinemas, in which virtue will have nothing to suffer and much to gain.
Source: Divini Illius Magistri (Vatican.va)