The doctrine of the Holy Eucharist is made up of:
1. The doctrine about the Eucharistic sacrifice states that the Holy Mass is a real sacrifice established by Christ during the Last Supper. It signifies Christ's sacrifice on the Cross, but in a non-bloody manner. Both the priest and the victim are Christ, with Christ offering himself through the priest. While the laity also participates in the sacrifice, they do not have the authority to perform transubstantiation. The Eucharistic sacrifice is offered to God in praise, thanksgiving, petition, and atonement for the living and the dead. Saints may also be remembered and honored. It is the responsibility of the Church to determine the rites and prayers to be observed. The liturgy is the public worship of the mystical Body of Christ. During every liturgical activity, Christ is present in a manner that should be appropriately interpreted.
2. The Eucharist is a sacrament instituted by Christ. Christ is truly present in the Eucharist, even when not being received, and is to be honored and adored. The whole Christ is present in either kind and is received by the communicant. The wheat bread and grape wine are transubstantiated by the ordained priest into the flesh and blood of Christ, so that only the appearance of bread and wine remains. The sacrament unites us deeply with Christ; it nourishes the soul, providing a transformative increase in grace and remitting venial sin and punishment
