Mark begins his book within the first few days of Jesus' ministry narrating his baptism by John the baptist. Jesus, throughout this gospel account, is taking action, proving his claim to be God's Son, the Christ, and the judge of all the earth. Jesus' authority is highlighted throughout this text as he is verbally affirmed by his Father from heaven and anointed with the Holy Spirit, tempted by Satan in the wilderness and victorious, beginning a public preaching ministry, and calling the first four of his disciples.