13 The same Document carefully draws out the doctrinal implications of this situation. Speaking of the members of these Communities, it declares: "All those justified by faith through Baptism are incorporated into Christ. They therefore have a right to be honoured by the title of Christian, and are properly regarded as brothers and sisters in the Lord by the sons and daughters of the Catholic Church". With reference to the many positive elements present in the other Churches and Ecclesial Communities, the Decree adds: "All of these, which come from Christ and lead back to him, belong by right to the one Church of Christ. The separated brethren also carry out many of the sacred actions of the Christian religion. Undoubtedly, in many ways that vary according to the condition of each Church or Community, these actions can truly engender a life of grace, and can be rightly described as capable of providing access to the community of salvation". These are extremely important texts for ecumenism. It is not that beyond the boundaries of the Catholic community there is an ecclesial vacuum. Many elements of great value ( eximia ), which in the Catholic Church are part of the fullness of the means of salvation and of the gifts of grace which make up the Church, are also found in the other Christian Communities.
Source: Ut Unum Sint (Vatican.va)