4 This teaching, which Our Predecessor Leo XIII set forth with such solemnity, We also proclaim with Our authority and We urge all to adhere to it religiously. No less earnestly do We inculcate obedience at the present day to the counsels and exhortations which he, in his day, so wisely enjoined. For whereas there arose new and serious difficulties and questions, from the wide-spread prejudices of rationalism and more especially from the discovery and investigation of the antiquities of the East, this same Our Predecessor, moved by zeal of the apostolic office, not only that such an excellent source of Catholic revelation might be more securely and abundantly available to the advantage of the Christian flock, but also that he might not suffer it to be in any way tainted, wished and most earnestly desired "to see an increase in the number of the approved and persevering laborers in the cause of Holy Scripture; and more especially that those whom Divine Grace has called to Holy Orders, should day-by-day, as their state demands, display greater diligence and industry in reading, meditating and explaining it."
Source: Divino Afflante Spiritu (Vatican.va)