The discussion held in one of the hall of the Second Vatican Council on the outline of the decree De oecumenismo enables us to distinguish two conspicuous attitudes: the integrist one on the one side and the reformist on the other. Both are displayed in the article. Yet apart from the attitudes mentioned above, it was for the first time in the history of the Catholic Church that the Counciliar bishops officially have spoken out on the issues connected to ecumenism. This discussion sparked the critical self-understanding of the Church. Furthermore, it allows us to create an attitude of openness for the values of the other Christian communities and to keep simultaneously the dogmatic truths intact.
