Let him who casts the first liturgical stone...
89. ... But to make it easier for the people to join in the response to the psalm, the Order of Readings lists certain other texts of psalms and responses that have been chosen according to the various seasons or classes of Saints. Whenever the psalm is sung, these texts may replace the text corresponding to the reading.113
Should, however, the continuous reading during the week from time to time be interrupted, on account of some Solemnity or Feast, or some particular celebration, then the Priest shall be permitted, bearing in mind the scheme of readings for the entire week, either to combine parts omitted with other readings or to decide which readings are to be given preference over others.
In Masses for special groups, the Priest shall be allowed to choose texts more particularly suited to the particular celebration, provided they are taken from the texts of an approved Lectionary.
Thus, in the Missal, thirty-four Masses for the Sundays and weekdays in Ordinary Time are found. They are used in this way: a) On Sundays the Mass corresponding to the number of the Sunday in Ordinary Time is ordinarily used, unless there occurs a Solemnity or a Feast of the Lord which takes the place of the Sunday. b) On weekdays, however, any of the thirty-four Masses may be used, provided the pastoral needs of the faithful are taken into consideration.
Since, indeed, many possibilities are provided for choosing the different parts of the Mass, it is necessary for the Deacon, the readers, the psalmist, the cantor, the commentator, and the choir to know properly before the celebration the texts that concern each and that are to be used, and it is necessary that nothing be in any sense improvised.
When a possibility is given of choosing between one or other text laid down, or suggested as optional, attention shall be paid to the good of participants, whether, that is to say, it is a matter of using an easier text or one more appropriate for a given gathering, or of repeating or setting aside a text that is assigned as proper to some particular celebration while being optional for another, just as pastoral advantage may suggest.
On the weekdays in Ordinary Time, however, besides the orations from the previous Sunday, orations from another Sunday in Ordinary Time may be used, or one of the Prayers for Various Needs provided in the Missal. However, it shall always be permissible to use from these Masses the Collect alone. In this way a richer collection of texts is provided, by which the prayer life of the faithful is more abundantly nourished.
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