22. By its very nature, the Mass requires that all present take part in it, each having a particular function.
a) Interior participation is the most important; this consists in paying devout attention, and in lifting up the heart to God in prayer. In this way the faithful "are intimately joined with their High Priest...and together with Him, and through Him offer (the Sacrifice), making themselves one with Him" (Mediator Dei, Nov. 20, 1947: AAS 39 [1947] 552).
b) The participation of the congregation becomes more complete, however, when, in addition to this interior disposition, exterior participation is manifested by external acts, such as bodily position (kneeling, standing, sitting), ceremonial signs, and especially responses, prayers, and singing.
The Supreme Pontiff Pius XII, in his encyclical on the sacred liturgy, Mediator Dei, recommended this form of participation:
"Those who are working for the exterior participation of the congregation in the sacred ceremonies are to be warmly commended. This can be accomplished in more than one way. The congregation may answer the words of the priest, as prescribed by the rubrics, or sing hymns appropriate to the different parts of the Mass, or do both. Also, at solemn ceremonies, they may alternate in singing the liturgical chant (AAS 39 [1947] 560)".
When the papal documents treat of "active participation" they are speaking of this general participation (Mediator Dei: AAS 39 [1947] 530-537), of which the outstanding example is the priest, and his ministers who serve at the altar with the proper interior dispositions, and carefully observe the rubrics, and ceremonies.
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