Divino Afflante Spiritu §17

¹⁷ The great importance which should be attached to this kind of criticism was aptly pointed out by Augustine, when, among the precepts to be recommended to the student of the Sacred Books, he put in the first place the care to possess a corrected text. "The correction of the codices" - so says this most distinguished Doctor of the Church - "should first of all engage the attention of those who wish to know the Divine Scripture so that the uncollected may give place to the corrected." In the present day indeed this art, which is called textual criticism and which is used with great and praiseworthy results in the editions of profane writings, is also quite rightly employed in the case of the Sacred Books, because of that very reverence which is due to the Divine Oracles. For its very purpose is to insure that the sacred text be restored, as perfectly as possible, be purified from the corruptions due to the carelessness of the copyists and be freed, as far as may be done, from glosses and omissions, from the interchange and repetition of words and from all other kinds of mistakes, which are wont to make their way gradually into writings handed down through many centuries.