And on Sunday the priest in persona Christi offers the bread and wine to God, bread which the earth has given and human hands have made, and wine, fruit of the vine and work of human hands. He then speaks the words that Christ himself spoke the night before he died, recorded by the evangelists Matthew, Mark and Luke and so fulfilling the words recorded by John in the bread of life discourse.
As it says in the Catechism:
It is not man that causes the things offered to become the body and Blood of Christ, but he who was crucified for us, Christ himself. The priest, in the role of Christ, pronounces these words, but their power and grace are God's. This is my body, he says, This word transforms the things offered. (CCC,1375)So no Sunday, or any other day is ordinary, because through the Eucharist we are joined to that moment on Calvary when our God sacrificed himself for us.