The Church naturally adopted in her Liturgy, or public worship, the language which she then found prevailing among the people. The Fathers of the early Church generally wrote in the Latin tongue, which thus became the depository of the treasures of sacred literature in the Church.
In the fifth century came the disruption of the Roman Empire. New kingdoms began to be formed in Europe out of the ruins of the old empire. The Latin gradually ceased to be a living tongue among the people, and new languages commenced to spring up like so many shoots from the parent stock. The Church, however, retained in her Liturgy, and in the administration of the Sacraments, the Latin language for very wise reasons, some of which I shall briefly mention:
First--The Catholic Church has always _one and the same faith_, the same form of public worship, the same spiritual government. As her doctrine and liturgy are unchangeable, she wishes that the language of her Liturgy should be fixed and uniform. Faith may be called the jewel, and language is the casket which contains it. So careful is the Church of preserving the jewel intact that she will not disturb even the casket in which it is set. Living tongues, unlike a dead language, are continually changing in words and meaning. The English language as written four centuries ago would be now almost as unintelligible to an English reader as the Latin tongue. In an old Bible published in the fourteenth century St. Paul calls himself _the villain of Jesus Christ_. The word _villain_ in those days meant a servant, but the term would not be complimentary now to one even less holy than the Apostle. This is but one instance, out of many which I might adduce, to show the mutations which our language has undergone. But the Latin, being a dead language, is not liable to these changes.
Second--The Catholic Church is spread over the whole world, embracing in its fold children of all climes and nations, and peoples and tongues under the sun. How, I ask, could the Bishops of these various countries communicate with one another in council if they had not one language to serve as a common medium of communication? It would be simply impossible. A church that is universal must have a universal tongue; whilst a national church, or a church whose members speak one and the same language, and whose doctrines conveniently change to suit the times, can safely adopt the vernacular tongue in its liturgy.