Mysterium Fidei §34

³⁴ The few things that We have touched upon concerning the Sacrifice of the Mass encourage Us to say something about the Sacrament of the Eucharist, since both Sacrifice and Sacrament pertain to the same mystery and cannot be separated from each other. The Lord is immolated in an unbloody way in the Sacrifice of the Mass and He re-presents the sacrifice of the Cross and applies its salvific power at the moment when he becomes sacramentally present— through the words of consecration—as the spiritual food of the faithful, under the appearances of bread and wine.