The Catholic Church has engaged in the modern ecumenical movement especially since the Second Vatican Council (1962-1965) and the issuing of the decree Unitatis redintegratio and the declaration Dignitatis humanae. It was at the Council that the Pontifical Council for Promoting Christian Unity was created. Those outside of the Catholic Church were categorised as heretics (in reference to Protestantism) or schismatics (as in the case of the Eastern Orthodox Church and Oriental Orthodox Churches), but in many contexts today, in order to avoid offence, the euphemism "separated brethren" is used. Definition Ecumenism, from the Greek word “oikoumene”, meaning “the whole inhabited world” (cf. Acts 17.6; Mt 24.14; Heb 2.5), is the promotion of cooperation and unity among Christians. The Union of Christendom is a traditional Catholic view of ecumenism; the view is that every non-Catholic Christian ecclesial community is destined to return to the unity of the Catholic Church, from which it has broken. As the original Church founded by Jesus Christ according to Catholic doctrine, the Church sees itself as "the one true church". This means that according to such teaching, Christian unity is already a reality, present in the Catholic Church. The Catholic Church's commitment to ecumenism was based on the conviction that a divided Christianity "openly contradicts the will of Christ, scandalizes the world, and damages the holy cause of preaching the Gospel to every creature." "The search for Christian Unity was one of the principal concerns of the Second Vatican Council". This was attested to even from the moment the Council was announced, by Pope John XXIII, during the vespers closing the Octave of Prayer for Christian Unity on 25 January 1959, at the Basilica of Saint Paul Outside the Walls. "The Catholic Church is committed to working for the reunion of all Christians, but the exuberant spirit following Vatican II has been tempered. Sober minds realize that the road to full unity will be long and arduous. One of the principal ecclesiological tasks is to discern the relationship between the Churches." Underlying the Catholic Church's pursuit of ecumenism is its recognition that elements of sanctification and truth are found in other churches, that, in some sense, these are Christians and particular churches or ecclesial communities, and that common baptism itself impels those toward greater unity, since Baptism is a gift which "belongs" to the Catholic Church as one of the Sacraments which Christ endowed it