Such is the mystery of Christ, revealed and fulfilled in history according to the wisely ordered plan that St. Paul calls the "plan of the mystery" 2 and the patristic tradition will call the "economy of the Word incarnate" or the "economy of salvation."
Catechism number 1069
The word "liturgy" originally meant a "public work" or a
"service in the name of/on behalf of the people."
In Christian tradition it means the participation of the People of God in
"the work of God."5
Through the liturgy Christ, our redeemer and high priest, continues the work of
our redemption in, with, and through his Church.