Once the offerings have been placed on the altar and the accompanying rites completed, the invitation to pray with the priest and the prayer over the offerings conclude the preparation of the gifts and prepare for the Eucharistic Prayer. In the Mass, only one Prayer over the Offerings is said, and it ends with the shorter conclusion: Per Christum Dominum nostrum (Through Christ our Lord). If, however, the Son is mentioned at the end of this prayer, the conclusion is, Qui vivit et regnat in saecula saeculorum (Who lives and reigns forever and ever). The people, uniting themselves to this entreaty, make the prayer their own with the acclamation, Amen.
TheoFonsAd fontes fidei