43 In the same way, actually that baptism is the distinctive mark of all Christians, and serves to differentiate them from those who have not been cleansed in this purifying stream and consequently are not members of Christ, the sacrament of holy orders sets the priest apart from the rest of the faithful who have not received this consecration. For they alone, in answer to an inward supernatural call, have entered the august ministry, where they are assigned to service in the sanctuary and become, as it were, the instruments God uses to communicate supernatural life from on high to the Mystical Body of Jesus Christ. Add to this, as We have noted above, the fact that they alone have been marked with the indelible sign "conforming" them to Christ the Priest, and that their hands alone have been consecrated "in order that whatever they bless may be blessed, whatever they consecrate may become sacred and holy, in the name of our Lord Jesus Christ" Let all, then, who would live in Christ flock to their priests. By them they will be supplied with the comforts and food of the spiritual life. From them they will procure the medicine of salvation assuring their cure and happy recovery from the fatal sickness of their sins. The priest, finally, will bless their homes, consecrate their families and help them, as they breathe their last, across the threshold of eternal happiness.
Source: Mediator Dei (Vatican.va)