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.

The teaching of St. Augustine is so full that it might well fill a volume. The Church is the body of Christ and the Holy Ghost is the soul of that body ; for the Holy Ghost does in the Church all that the soul does in all the members of one body ; hence the Holy Ghost is for the body of Jesus, which is the Church, what the soul is for the human body. Therefore if we wish to live of the Holy Ghost, if we wish to remain united to him, we must preserve charity,love truth, will unity, and persevere in the Catholic faith ; for just as a member amputated from the body is no longer vivified by the soul, so he who has ceased to belong to the Church receives no more the life of the Holy Spirit. 4 " The Catholic Church alone is the body of Christ . . . outside that body the Holy Spirit gives life to no man . . consequently those who are outside the Church have not the Holy Spirit." 5 " His body is the Church, not this Church or that Church, but the Church throughout the whole world ; . . .for the whole Church, consisting of all the faithful, since all the faithful are members of Christ, has in Heaven that Head which rules his body." 6 In his De Unitate Ecclesiae (2), he tells us that " the Church is the body of Christ, as the Apostle teaches. 7 Whence it is manifest that he who is not a member of Christ cannot share in the salvation of Christ.