The Holy Qurbana: Liturgy of Saints Addai And Mari

The Holy Qurbana is referred to as "complete" worship, since it is performed for the benefit of all members of the church. The other sacraments are celebrated for individual members. Thus the Holy Qurbana is believed to be the sacrament that completes all the others. Hence it is called the "sacrament of perfection" or the "queen of sacraments".