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What did St. John the Baptist teach about God’s coming judgment?

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St. John the Baptist taught that God’s Last Judgment on the world was imminent. He urged all people to prepare for this event by repenting of their sins, living a righteous life characterized by justice and charity, and producing appropriate fruits of repentance.12

To symbolize this preparation, John performed a rite of baptism by immersion in running water. This act served as an anticipatory submission to the coming judgment rather than a sacrament of salvation or rebirth. John taught that a figure mightier than himself would follow, who would perform a second "baptism" with the Holy Spirit and with fire—a process that may symbolize the judgment itself, described as a river of fire.12