He instituted the holy Mass in order to represent and continue the sacrifice of Calvary. St Paul says, in his first epistle to the Corinthians, xi. 26, that it was instituted to show the death of the Lord until His second coming. After the consecration, which the priest effects by saying over the bread and wine the same words which Jesus Christ said at the Last Supper, there is no longer bread and wine, but the true and living Jesus Christ, God and man, hidden under the appearances of bread and wine, just as in the manger He was hidden under the appearance of an infant. The priest offers Him up to His heavenly Father in the name of the Catholic Church, or rather He offers Himself up, and we can confidently hope that we will obtain more through prayers at the holy Mass than through our own unaided prayers. In order to have part in the holy sacrifice of the Mass a person should follow the actions and prayers of the priest, especially at the offertory, consecration, and communion; meditate on the passion of Christ; say the rosary or the prayers in the prayer-books, at the same time uniting his intention with the intention of the sacrificing priest. The sacrifice of the Mass is a true sacrifice, because it is the oblation of a victim to God to represent by its destruction or change His supreme dominion over life and death. It is offered to satisfy our four great debts and wants in adoration to God on account of His omnipotence, in thanksgiving for His benefits, in atonement for our sins, and to obtain His assistance in difficulties and temptations. The holy Mass obtains for us all graces and blessings, temporal and spiritual. Since the Mass is the highest act of public worship, it is proper that it should be celebrated with fitting sacred ceremonies. Every ceremony which the Church prescribes has its deep significance. All tend to bring before our minds the mystery of the passion.