In 1974, a Trabant -- an old East German car -- was chugging through the Thuringian countryside, a province in the communist German Democratic Republic.In its passenger seat sat Professor Joseph Ratzinger and at the wheel was Father Joachim Wanke, then an assistant at a local seminary -- the only one in the GDR.The two priests, writes Rainer Erice, a journalist for the German radio station Mitteldeutsche Rundfunk Thüringen (MDR), were on a harmless sightseeing tour, taking in the historic cities of Jena and Weimar. It was a moment of relaxation during Father Ratzinger's short visit to East Germany, the...