It took me a while to figure out what you were referring to (your words in bold), because it’s a bit off, and out of perspective. This is what I think you were referring to:the priest says:]
Pray, brethren (brothers and sisters), that my sacrifice
and yours may be acceptable to God, the almighty Father.
the people rise and reply:]
May the Lord accept the sacrifice at your hands* for the praise and glory of his name, for our good and the good of all his holy Church.
***** (the “Lord” refers to the Father)This is the Prayer Over the Gifts, that’s said over the bread and wine before the Consecration. This is an explanation that I found:"The wording of the new translation makes clear the theological truth that there is only one sacrifice, and that that sacrifice belongs both to the priest and the people. The response of the people, made after they rise, since all responses to a prayer of the priest are made standing] makes clear that, while the sacrifice is that of priest and people, it is offered at the hands of the priest who stands in the person of Christ. This prayer, prayed as we move toward the Eucharistic Prayer, reinforces the truth that the sacrifice is offered to the praise and glory of the Father, for the salvation of all present and for the entire holy Church."That “one sacrifice” was offered by Jesus from the Cross. Catholics do not “reenact” the Sacrifice of Calvary, like people around the US reenact revolutionary war, or civil war battles. But by the power of the Holy Spirit, in the Presence of the Father, we are actually spiritually present with Jesus as He hangs on the cross. We are surrounded in spirit by the Church Militant (the entire Church on earth), the Church Suffering (the Holy Souls in Purgatory) and the Church Triumphant (all the Saints in Heaven), along with all of the holy angels of Heaven. We have to remember that God is not subject to time as we know it. For God, everything that we might think about happening at a specific ‘time’, is happening now.
(all emphasis mine)