Mass in the Catholic Church

The Council of Trent reaffirmed traditional Christian teaching that the Mass is the same Sacrifice of Calvary offered in an unbloody manner: "The victim is one and the same: the same now offers through the ministry of priests, who then offered himself on the cross; only the manner of offering is different. And since in this divine sacrifice which is celebrated in the Mass, the same Christ who offered himself once in a bloody manner on the altar of the cross is contained and offered in an unbloody manner... this sacrifice is truly propitiatory" (Doctrina de ss. Missae sacrificio, c. 2, quoted in Catechism of the Catholic Church, 1367). The Council declared that Jesus instituted the Mass at his Last Supper: "He offered up to God the Father His own body and blood under the species of bread and wine; and, under the symbols of those same things, He delivered (His own body and blood) to be received by His apostles, whom He then constituted priests of the New Testament; and by those words, Do this in commemoration of me, He commanded them and their successors in the priesthood, to offer (them); even as the Catholic Church has always understood and taught."[2]
The Roman Catholic Church sees the Mass as the most perfect way it has to offer latria (adoration) to God. It is also Catholic belief that in objective reality, not merely symbolically, the wheaten bread and grape wine are converted into Christ's body and blood, a conversion referred to as transubstantiation, so that the whole Christ, body and blood, soul and divinity, is truly, really, and substantially contained in the sacrament of the Eucharist.[3]