31 But there is something else that We would like to add that is very helpful in shedding light on the mystery of the Church; We mean the fact that the whole Church plays the role of priest and victim along with Christ, offering the Sacrifice of the Mass and itself completely offered in it. The Fathers of the Church taught this wondrous doctrine. (24) A few years ago Our predecessor of happy memory, Pius XII, explained it. (25) And only recently the Second Vatican Council reiterated it in its Constitution on the Church, in dealing with the people of God. (26) To be sure, the distinction between the universal priesthood and the hierarchical priesthood is something essential and not just a matter of degree, and it has to be maintained in a proper way. (27) Yet We cannot help being filled with an earnest desire to see this teaching explained over and over until it takes deep root in the hearts of the faithful. For it is a most effective means of fostering devotion to the Eucharist, of extolling the dignity of all the faithful, and of spurring them on to reach the heights of sanctity, which means the total and generous offering of oneself to the service of the Divine Majesty.
Source: Mysterium Fidei (Vatican.va)