The article includes a detailed analysis of pagan beliefs in 'Summa de Confesionis Discretione', the handbook which was found in a Cistercian monastery in Rudy in the Upper Silesia. The authoress traces back the origin of the written monument, contending that it was written in the 13th century in Germany. To Silesia, the work may have come along with the German settlers who stayed in the Cistercian estate. Then, the authoress reconsiders the contents of 'Summa' in the light of comparative materials of that era; finally, she broadly analyses various pagan beliefs and folk customs described in 'Summa', comparing them with the ethnographic material from Poland, Bohemia and Germany. Original article printed with German abstract.