Works on the revisions for the new edition has occupied the author for more than a year. So major have the changes been that the translation has been worked through again completely and the text reset. Bibliographical details in the notes have been completely updated and large sections have been rewritten; the equivalent of a small book has been added to the length. Dr. Grillmeier has been particularly concerned to give a new account of the theological development between Origen and the Council of Nicaea, which now has a chapter of its own.