Who is John the Baptist and why is he important? What does it mean to repent? Why would God use him to herald the arrival of Jesus? How are he and Jesus related? Why does John baptize people? What did he require of them before being baptized? Why would he not baptize the Pharisees and Sadducees? How is God's wrath a good thing? What does it mean to be purified by fire? Why did Jesus need to be baptized? How does the Trinity appear during His baptism?