55 With these and the like principles Anselm laid the foundations of the true principles of philosophical and theological studies which other most learned men, the princes of scholasticism, and chief among them the Doctor of Aquin, followed, developed, illustrated and perfected to the great honor and protection of the Church. If We have insisted so willingly on this distinction of Anselm, it is in order to have a new and much-desired occasion, venerable brethren, to inculcate upon you to see to it that you bring back youth, especially among the clergy, to the most wholesome springs of Christian wisdom, first opened by the Doctor of Aosta and abundantly enriched by Aquinas. On this head remember always the instructions of Our Predecessor Leo XIII, of happy memory (Encyclical "Aeterni Patris," diei 4 Augusti, an. 1879), and those We have Ourself given more than once, and again in the above-mentioned Encyclical "Pascendi dominici gregis." Bitter experience only too clearly proves every day the loss and the ruin ensuing from the neglect of these studies, or from the pursuit of them without a clear and sure method; while many, before being fitted or prepared, presume to discuss the deepest questions of the faith ("De fide Trinitatis," cap. 2). Deploring this evil with Anselm, We repeat the strong recommendations made by him: "Let no one rashly plunge into the intricate questions of divine things until he has first acquired, with firmness in the faith, gravity of conduct and of wisdom, lest while discussing with uncautious levity amid the manifold twistings of sophistry he fall into the toils of some tenacious error" ( Ibid .). And this same incautious levity, when heated, as so often is the case, at the fire of the passions, proves the total ruin of serious studies and of the integrity of doctrine. Because, puffed up with that foolish pride, lamented by Anselm in the heretical dialecticians of his time, they despise the sacred authorities of the Holy Scriptures, and of the Fathers and Doctors, concerning which a more modest genius would be glad to use instead the respectful words of Anselm: "Neither in our own time nor in the future do we ever hope to see their like in the contemplation of the truth" ("De fide Trinitatis," Praefatio.)
Source: Communium Rerum (Vatican.va)