62 It is necessary ever to keep in mind these teachings and pronouncements which We have made; it is no less necessary to reawaken that spirit of faith, of supernatural love, and of Christian discipline which alone can bring to these principles correct understanding, and can lead to their observance. This is particularly important in the case of youth, and especially those who aspire to the priesthood, so that in the almost universal confusion in which we live they at least, as the Apostle writes, will not be "tossed to and fro, and carried about with every wind of doctrine by the wickedness of men, by cunning craftiness, by which they lie in wait to deceive." ( Ephesians iv, 14)
Source: Ubi Arcano Dei Consilio (Vatican.va)