Answer: The possibility for liturgy and church services to be performed in Slavic languages.
Explanation: When Greek missionaries wanted to distribute Christianity among Slovenes, the two Greek minions Cyril and Methodius were given the task of writing a letter that is characteristic of the Slavic languages, so that the Slavs could understand church books and services and serve in their own languages. Thus Cyril wrote a letter called Cyrillic alphabet which was widely spread among the Slavs in the Balkans as well as among the Russians. In the nineteenth century Catholic Slavs in the Balkans accepted the Latin alphabet.
