27 Many are the reasons why We are so desirous of this. In the first place, then, since in the tempest that is on us the Christian faith is being constantly assailed by the machinations and craft of a certain false wisdom, all youths, but especially those who are the growing hope of the Church, should be nourished on the strong and robust food of doctrine, that so, mighty in strength and armed at all points, they may become habituated to advance the cause of religion with force and judgment, "being ready always, according to the apostolic counsel, to satisfy every one that asketh you a reason of that hope which is in you,"(39) and that they may be able to exhort in sound doctrine and to convince the gainsayers."(40) Many of those who, with minds alienated from the faith, hate Catholic institutions, claim reason as their sole mistress and guide. Now, We think that, apart from the supernatural help of God, nothing is better calculated to heal those minds and to bring them into favor with the Catholic faith than the solid doctrine of the Fathers and the Scholastics, who so clearly and forcibly demonstrate the firm foundations of the faith, its divine origin, its certain truth, the arguments that sustain it, the benefits it has conferred on the human race, and its perfect accord with reason, in a manner to satisfy completely minds open to persuasion, however unwilling and repugnant.
Source: Aeterni Patris (Vatican.va)