81. When a choice is allowed between alternative texts, whether they are fixed or optional, the first consideration must be the best interest of those taking part. It may be a matter of using the easier texts or the one more relevant to the assembled congregation or, as pastoral advantage may suggest, of repeating or replacing a text that is assigned as proper to one celebration and optional to another.The issue may arise when it is feared that some text will create difficulties for a particular congregation or when the same text would have to be repeated within a few days, as on a Sunday and on a day during the week following.
This last point could arise two or three times a year. The overall guiding principle would be to ask what advances the community in holiness,