Here precisely was made a mistake which takes its toll on the Church. The Church, in order to perform its duty towards man, stopped staring at God; and supposedly to better serve man, began to stare at him and at his needs. The priest turned away from God and turned towards man. It is a symbol contained in the Holy Mass that is striking from the very beginning. Thus, the priest forgets that he celebrates the entire sacrifice of the Holy Mass for God, and begins to do it for man. Pronouncing words addressed to God the Father, he is however staring at man and most often says them altogether unwittingly, judging outright that he celebrates this Sacrifice for man, in order to bring over God for man, so that God may bestow upon him graces. This is a basic error, which entails subsequent ones. The priest performs the Sacrifice for God, to offer to God the Father the Passion of our Lord Jesus Christ, and to apologize to God for our sins and the sins of the entire mankind, and especially the sins of those for whom the Holy Mass is celebrated and those who are present at it, but the dimension of the Holy Mass remains the same. The most Holy Sacrifice of Christ is offered by the priest to the Heavenly Father to appease His righteous anger because of our sins. God the Father, accepting this Sacrifice as a result of all the pleas of the Savior on the cross, gives us graces. This is the truth that is immutable. The Holy Mass is a Sacrifice for God.
Translated from : Tajemnica Mszy świętej według św. Ojca Pio na podstawie Orędzi na Czasy Ostateczne które własnie nadeszły, Grzechynia 2013, p. 27-28