Considering that the Holy Eucharist (Holy Mass) has always been the true central point of Catholic worship, we consider it our duty to declare that we maintain with perfect fidelity the ancient Catholic doctrine concerning the Sacrament of the Altar, by believing that we receive the Body and the Blood of our Savior Jesus Christ under the species of bread and wine. The Eucharistic celebration in the Church is neither a continual repetition nor a renewal of the expiatory sacrifice which Jesus offered once for all upon the Cross, but it is a sacrifice because it is the perpetual commemoration of the sacrifice offered upon the Cross; and it is the act by which we represent upon earth and appropriate to ourselves the one offering which Jesus Christ makes in Heaven, according to the Epistle to the Hebrews 9:11,12, for the salvation of redeemed humanity, by appearing for us in the presence of God (Hebrews 9:24). The character of the Holy Eucharist being thus understood, it is, at the same time, a sacrificial feast by means of which the faithful in receiving the Body and the Blood of our Savior enter into communion with one another (1 Corinthians 10:17).

Declaration of Scranton (PNCC/NCC)