ENThe language of the church service has always been an important element for the Lithuanian minority in Poland. After the Second World War the borders of Poland were changed and the country was considered to be a single-nation country. There were three parishes in Łomża diocese (Punskas, Smalėnai, and Seinai) where Lithuanians made significant part of inhabitants and had the church service in their language. In 1945 the secret police (Urząd Bezpieczeństwa) asked the authorities of Łomża diocese to close down the services in the Lithuanian language. A. Žievys, the parish priest of Punskas, acted with such conviction that the service was not closed down. In 1946 the parish priest of Seinai died and the Lithuanian service was cancelled, that is to say there were no priests who knew the Lithuanian language. The struggle for the Lithuanian church service in Seinai took place from 1946 to 1983 and was of various forms. The pope John Paul II sent the bishop Juliusz Paetz to Łomża diocese and considered the endeavours of the Lithuanian congregation.