Johann Gerhard makes the promise of justification, along with its effective outworking in Christian life through sanctification, central to his treatment of baptism. Gerhard writes that God has been faithful to his promises of justification and redemption through the whole course of salvation history. Baptism is simply the covenantal promise of grace and justification as it has been manifested throughout the history of salvation. As his main n premise, Gerhard held that God is faithful to his promises of forgiveness and grace. Therefore, the promise of justification present in baptism runs through various types and rituals in the Old Testament. Ultimately, for Gerhard the sacrament of baptism manifests God’s faithfulness and willingness to forgive sinners for the sake of the blood of Jesus….
Gerhard mines the Old Testament for types of baptism. Those familiar with Gerhard will know that, like others in the period of Lutheran Orthodoxy, he is extremely fond of typological readings of Scripture.1 … [Christians today may find some of his typological interpretations unconvincing.] However, Gerhard finds more plausible prefigurations of the justifying and sanctifying properties of baptism in the texts of the Old Testament major prophets. God promised the prophet Isaiah that he would give water to the thirsty and pour out his life-giving Spirit (Isa. 44:3-4). He also promised that the resurrected Suffering Servant would “sprinkle many nations” (Isa. 52:15).2
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