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Sacraments › … › II. The Sacrament of Holy Orders in the Economy of Salvation
The one priesthood of Christ
The redemptive sacrifice of Christ is unique, accomplished once for all; yet it is made present in the Eucharistic sacrifice of the Church. The same is true of the one priesthood of Christ; it is made present through the ministerial priesthood without diminishing the uniqueness of Christ's priesthood: "Only Christ is the true priest, the others being only his ministers."
Source: Catechism of the Catholic Church (Vatican.va)