>> “ Even in discussions about Jerome apparently changing his mind about the canon, there is no mention of the prefaces to Judith and to Tobit. None! How is that possible?” <<
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Seriously, who, having a grip on their senses, gives a hoot about Judith or Tobit?
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It’s not the significance of the biblical book, but the fact that Jerome states, unambiguously, that he is obeying the practice of the Christians of his day by including them. In the case of Judith, he cites the Council of Nicea, which included a consensus of the bishops from the entire Roman world, as why he must include Judith.