IV. The Eucharist and the Sacrament of Holy Orders
In persona Christi capitis
23. The intrinsic relationship between the Eucharist and the sacrament of Holy Orders clearly emerges from Jesus' own words in the Upper Room: "Do this in memory of me" (Lk 22:19). On the night before he died, Jesus instituted the Eucharist and at the same time established the priesthood of the New Covenant. He is priest, victim and altar: the mediator between God the Father and his people (cf. Heb 5:5-10), the victim of atonement (cf. 1 Jn 2:2, 4:10) who offers himself on the altar of the Cross. No one can say "this is my body" and "this is the cup of my blood" except in the name and in the person of Christ, the one high priest of the new and eternal Covenant (cf. Heb 8-9).
The Church teaches that priestly ordination is the indispensable condition for the valid celebration of the Eucharist.(71) Indeed, "in the ecclesial service of the ordained minister, it is Christ himself who is present to his Church as Head of his Body, Shepherd of his flock, High Priest of the redemptive sacrifice." (72) Certainly the ordained minister also acts "in the name of the whole Church, when presenting to God the prayer of the Church, and above all when offering the eucharistic sacrifice." (73)
As a result, priests should be conscious of the fact that in their ministry they must never put themselves or their personal opinions in first place, but Jesus Christ. Any attempt to make themselves the centre of the liturgical action contradicts their very identity as priests. The priest is above all a servant of others, and he must continually work at being a sign pointing to Christ, a docile instrument in the Lord's hands. This is seen particularly in his humility in leading the liturgical assembly, in obedience to the rite, uniting himself to it in mind and heart, and avoiding anything that might give the impression of an inordinate emphasis on his own personality. I encourage the clergy always to see their eucharistic ministry as a humble service offered to Christ and his Church. The priesthood, as Saint Augustine said, is amoris officium, (74) it is the office of the good shepherd, who offers his life for his sheep (cf. Jn 10:14-15).