Why should we be interested in the Filioque problem? Why should we spend time on dealing with one of the most subtle subtleties of the doctrine of Trinity as the question whether in the eternal life of God the Holy Spirit “proceeds” “from the Father”, “from the Father alone”, “from the Father through the Son” or “from the Father and the Son” apparently is? And why should we put effort into understanding a detail within the tradition of the Nicean-Constantipolitanean Creed, a Creed which is (at least in German Lutheran churches) almost never ever used? Might there a question be imagined that seems to be more irrelevant to our present problems and tasks in Church and theology?