50 Let priests therefore, who are bound by their office to procure the eternal salvation of the faithful, after they have themselves by diligent study perused the sacred pages and made them their own by prayer and meditations, assiduously distribute the heavenly treasures of the divine word by sermons, homilies and exhortations; let them confirm the Christian doctrine by sentences from the Sacred Books and illustrate it by outstanding examples from sacred history and in particular from the Gospel of Christ Our Lord; and - avoiding with the greatest care those purely arbitrary and far-fetched adaptations, which are not a use, but rather an abuse of the divine word - let them set forth all this with such eloquence, lucidity and clearness that the faithful may not only be moved and inflamed to reform their lives, but may also conceive in their hearts the greatest veneration for the Sacred Scripture.
Source: Divino Afflante Spiritu (Vatican.va)