Among the special schemes with which non-Catholics plot against the adherents of Catholic truth to turn their minds away from the faith, the biblical societies are prominent. They were first established in England and have spread far and wide so that We now see them as an army on the march, conspiring to publish in great numbers copies of the books of divine Scripture. These are translated into all kinds of vernacular languages for dissemination without discrimination among both Christians and infidels. Then the biblical societies invite everyone to read them unguided. Therefore it is just as Jerome complained in his day: they make the art of understanding the Scriptures without a teacher “common to babbling old women and crazy old men and verbose sophists,” and to anyone who can read, no matter what his status. Indeed, what is even more absurd and almost unheard of, they do not exclude the common people of the infidels from sharing this kind of knowledge.
But you know the aim of these societies. In his sacred writings, Peter, after praising the letters of Paul, warns that in these epistles “certain things are difficult to understand, which the unlearned and the unstable distort just as they do the rest of the Scriptures, which also leads to their destruction.” He adds at once, “Since you know this beforehand, be on your guard lest, carried away by the error of the foolish, you fall away from your own steadfastness.” Hence it is clear to you that even from the first ages of Christianity this was a skill appropriate for heretics. Having repudiated the given word of God and rejected the authority of the Catholic Church, they either interpolate “by artifice” into the Scriptures or pervert “its meaning through interpretation.” Nor finally are you ignorant of the diligence and knowledge required to faithfully translate into another language the words of the Lord. In the many translations from the biblical societies, serious errors are easily inserted by the great number of translators, either through ignorance or deception. These errors, because of the very number and variety of translations, are long hidden and hence lead the faithful astray. It is of little concern to these societies if men reading their vernacular Bibles fall into error. They are concerned primarily that the reader becomes accustomed to judging for himself the meaning of the books of Scripture, to scorning divine tradition preserved by the Catholic Church in the teaching of the Fathers, and to repudiating the very authority of the Church. – from Inter Praecipuas (1844)