88 Nor is it to be wondered at, that the faithful should be raised to this dignity. By the waters of baptism, as by common right, Christians are made members of the Mystical Body of Christ the Priest, and by the "character" which is imprinted on their souls, they are appointed to give worship to God. Thus they participate, according to their condition, in the priesthood of Christ.
Source: Mediator Dei (Vatican.va)