For the Reformed understanding of baptism, the doctrine of the Holy Spirit is fundamental. In the fifth or sixth century, the sacrament of baptism began to be split into two sacraments. Baptism proper was understood as the washing away of sins, while the sacrament of confirmation was understood to confer the gift of the Holy Spirit. The Reformers were very much opposed to any understanding of baptism in which baptism with water was one thing and baptism of the Holy Spirit was something else. Using Augustinian terms, they saw baptism with water as the outward sign of baptism with the Holy
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