reckon with the probable presence of one or more unknown “prophets” in a given work. Some modern readers reject the idea of additions to the sayings of the prophets, on the grounds that such additions would constitute plagiarism. There are two problems with their objection. First, it brings a modern, idealized concept of authorship to bear on ancient authorship. Apparently people were not concerned much about plagiarism until books could be mass produced by printing, so that authors could earn money