For just as circumcision, which was a kind of badge to the Jews, assuring them that they were adopted as the people and family of God, was their first entrance into the Church, while they, in their turn, professed their allegiance to God, so now we are initiated by baptism, so as to be enrolled among his people, and at the same time swear unto his name. Hence it is incontrovertible, that baptism has been substituted for circumcision, and performs the same office.
