84 It is superfluous to explain how captious errors of this sort completely contradict the truths which we have just stated above, when treating of the place of the priest in the Mystical Body of Jesus Christ. But we deem it necessary to recall that the priest acts for the people only because he represents Jesus Christ, who is Head of all His members and offers Himself in their stead. Hence, he goes to the altar as the minister of Christ, inferior to Christ but superior to the people. The people, on the other hand, since they in no sense represent the divine Redeemer and are not mediator between themselves and God, can in no way possess the sacerdotal power.
Source: Mediator Dei (Vatican.va)