uus,
“Every high priest taken from among men is ordained for men in the things that appertain to God, that he may offer up gifts and sacrifices for sins.” (Hebrews 5:1) St. Thomas Aquinas teaches that the proper office of a priest is to be a mediator between God and men, inasmuch as he is the representative of God with the people, bringing to them in return for their “gifts and sacrifices,” both pardon for sin, and those “most great and precious promises” by which they are “made partakers of the divine nature.” ( 2 Peter 1:4 )
Priesthood and sacrifice are correlative. The essential act of priesthood is the offering of sacrifice, both as the supreme act of man’s worship of God ( latreutic ), and in expiation for the sins of men ( propitiatory ); and our High Priest and Mediator, Jesus Christ, performed this supreme act of his Priesthood when he offered himself in sacrifice to His Heavenly Father on the Cross both as the perfect and supreme act of divine worship, and as the efficacious expiation of the sins of the world.
Another act of Our Lord as High Priest and Redeemer was to establish his Church for the salvation of the world through the merits of his Sacrifice on Calvary. He, the eternal Priest, would be its Head and High Priest. But since he was about to withdraw his corporal presence from his Church, it was necessary that his Priesthood should be exercised visibly and externally by a body of ministers appointed by himself and acting in his name.
Our Lord, therefore, on the day before he suffered, having for the last time celebrated with his Apostles the legal feast of the Paschal Lamb, instituted the Eucharistic Sacrifice of the New Testament, first, as the perennial commemoration of the Sacrifice of Redemption on Calvary, and secondly, in order that the merits of the Sacrifice of the Cross might be applied to individual souls for the remission of their sins. Further, in order that this memorial Sacrifice might be offered in the Church till the end of time, and “show forth the death of the Lord until he come,” ( 1 Corinthians 11:26 ) by the words, “Do this in commenoration of me,” he ordained his Apostles priests and gave them power to ordain others in their turn, and thus established in his Church a permanent and perpetual Order of Christian Priesthood.
Tomster