12 It is a matter of equal importance to provide in time for a continuous succession of such teachers; and it will be well, wherever this can be done, to select young men of good promise who have successfully accomplished their theological course, and to set them apart exclusively for Holy Scripture, affording them facilities for full and complete studies. Professors thus chosen and thus prepared may enter with confidence on the task that is appointed for them; and that they may carry out their work well and profitably, let them take heed to the instructions We now proceed to give.
Source: Providentissimus Deus (Vatican.va)