25 If they remember the saying of the ancients, that knowledge merits the name of cleverness rather than wisdom when it is separated from justice, or better yet if they meditate on the words of Scripture: "They are vain, those men in whom there is no knowledge of God,"(Wis 13.1) they will learn to use the weapons of knowledge less for their personal gain than for the general good. They can expect their efforts to produce the same fruits as Peter Canisius long ago obtained in his colleges and institutions: obedient young people who are eager to learn and are vigorous, who detest the example of the impious, and are equally attracted to knowledge and virtue. When their piety has grown deep, there will practically be no need to fear that their souls will be affected by error or turned away from virtue. It is on them that the Church, on them that society base their fondest hope. They will be the eminent citizens of the future on whose wisdom, prudence, and knowledge will depend both the salvation of the social order and the tranquillity of domestic life.
Source: Militantis Ecclesiae (Vatican.va)