13 At the commencement of a course of Holy Scripture let the Professor strive earnestly to form the judgment of the young beginners so as to train them equally to defend the sacred writings and to penetrate their meaning. This is the object of the treatise which is called "Introduction." Here the student is taught how to prove the integrity and authority of the Bible, how to investigate and ascertain its true sense, and how to meet and refute objections. It is needless to insist upon the importance of making these preliminary studies in an orderly and thorough fashion, with the accompaniment and assistance of Theology; for the whole subsequent course must rest on the foundation thus laid and make use of the light thus acquired. Next, the teacher will turn his earnest attention to that more fruitful division of Scripture science which has to do with Interpretation; wherein is imparted the method of using the word of God for the advantage of religion and piety. We recognize without hesitation that neither the extent of the matter nor the time at disposal allows each single Book of the Bible to be separately gone through. But the teaching should result in a definite and ascertained method of interpretation-and therefore the Professor should equally avoid the mistake of giving a mere taste of every Book, and of dwelling at too great length on a part of one Book. If most schools cannot do what is done in the large institutions-that is, take the students through the whole of one or two Books continuously and with a certain development-yet at least those parts which are selected should be treated with suitable fulness; in such a way that the students may learn from the sample that is thus put before them to love and use the remainder of the sacred Book during the whole of their lives. The Professor, following the tradition of antiquity, will make use of the Vulgate as his text; for the Council of Trent decreed that "in public lectures, disputations, preaching, and exposition,"(29) the Vulgate is the "authentic" version; and this is the existing custom of the Church. At the same time, the other versions which Christian antiquity has approved, should not be neglected, more especially the more ancient MSS. For although the meaning of the Hebrew and Greek is substantially rendered by the Vulgate, nevertheless wherever there may be ambiguity or want of clearness, the "examination of older tongues,"(30) to quote St. Augustine, will be useful and advantageous. But in this matter we need hardly say that the greatest prudence is required, for the "office of a commentator," as St. Jerome says, "is to set forth not what he himself would prefer, but what his author says."(31) The question of "readings" having been, when necessary, carefully discussed, the next thing is to investigate and expound the meaning. And the first counsel to be given is this: That the more our adversaries contend to the contrary, so much the more solicitously should we adhere to the received and approved canons of interpretation. Hence, whilst weighing the meanings of words, the connection of ideas, the parallelism of passages, and the like, we should by all means make use of such illustrations as can be drawn from apposite erudition of an external sort; but this should be done with caution, so as not to bestow on questions of this kind more labour and time than are spent on the Sacred Books themselves, and not to overload the minds of the students with a mass of information that will be rather a hindrance than a help.
Source: Providentissimus Deus (Vatican.va)