The trouble today is that many Christians live in a kind of bubble of assumptions about what their Christianity means, especially if it places them comfortably among "the good guys," - assumptions that are likely to be drawn as much from folk-Christianity, surrounding political culture, popular pulp-books about the "End Times," or their favourite guru writer or therapist, than from sober and comprehensive reading of the Bible as a whole. Prophets and preachers have the unwelcome task of pricking that bubble with the sharpness of actual texts and teachings of the Bible itself.