The Protestant Reformers said that the Bible is the sole authoritative source of religious truth, whose proper understanding must be found by looking only at the words of the text itself. This is the Protestant teaching of sola scriptura (Latin: by Scripture alone). According to this teaching, no outside authority may mandate an interpretation, because no outside authority, such as the Church, has been established by Christ as an arbiter to determine which of the conflicting interpretations is correct.
During the Reformation, primarily for doctrinal reasons, Protestants removed seven books from the Old Testament: 1 and 2 Maccabees, Sirach, Wisdom, Baruch, Tobit, and Judith, and parts of two others, Daniel and Esther. They did so even though these books had been regarded as canonical since the beginning of Church history.
At Catholic Answers we are often asked which Bible version a person should choose. This is an important question about which Catholics need to be informed. Some have been given very little help about how to pick a Bible translation, but keeping in mind a few tips will make the decision much easier.
"It is the peculiarity of progress for a thing to be developed in itself; and the peculiarity of change, for a thing to be altered from what it was into something else."
~ Vincent of Lerins, Saint, noting the essential difference between development and alteration of the deposit of faith, over 1,000 years before Protestantism radically altered the face of Christianity. (Commonitorium, I, 23; see P.L., L). (see "Science and the Church")