Let’s begin with a plan, and the concern about unity and discord:
10. To be considered first of all is the choice of the languages that it will be permissible to put into use in liturgical celebrations. It is appropriate that there be elaborated in each territory a pastoral plan that takes account of the spoken languages there in use, with a distinction being made between languages which the people spontaneously speak and those which, not being used for natural communication in pastoral activity, merely remain the object of cultural interest. In considering and drafting such a plan, due caution should be exercised lest the faithful be fragmented into small groups by means of the selection of vernacular languages to be introduced into liturgical use, with the consequent danger of fomenting civil discord, to the detriment of the unity of peoples as well as of the unity of the particular Churches and the Church universal.