Pope John Paul II
Slavorum Apostoli §26
Slavorum Apostoli: In Commemoration of the Eleventh Centenary of the Evangelizing Work of Saints Cyril and Methodius
26 Ever since the ninth century, when in Christian Europe a new organization was emerging, Saints Cyril and Methodius have held out to us a message clearly of great relevance for our own age, which precisely by reason of the many complex problems of a religious, cultural, civil and international nature, is seeking a vital unity in the real communion of its various elements. It can be said of the two evangelizers that characteristic of them was their love for the communion of the universal Church both in the East and in the West, and, within the universal Church, love for the particular Church that was coming into being in the Slav nations. From them also comes for the Christians and-people of our time the invitation to build communion together. But it is in the specific area of missionary activity that the example of Cyril and Methodius is of even greater value. For this activity is an essential task of the Church, and is urgent today in the already mentioned form of "inculturation". The two Brothers not only carried out their mission with full respect for the culture already existing among the Slav peoples, but together with religion they eminently and unceasingly promoted and extended that culture. By analogy, today the Churches of ancient origin can and must help the young Churches and peoples to mature in their own identity and progress in it.
Source: Slavorum Apostoli (Vatican.va)