“And he sent them out to proclaim the kingdom of God and to heal” (v2). The disciples obeyed, “preaching the gospel and healing everywhere” (v6). The cross and resurrection hadn’t happened yet; therefore, the disciples were sharing the good news that the presence and power of God had entered the world in Jesus Christ (and would soon be fully demonstrated by the cross). Healing and casting out demons were signs that God’s power was active. God was no longer distant; the Messiah had arrived.
“Now Herod the Tetrarch heard about all that was happening …” (v7). When Jesus is present by the Spirit, God’s kingdom has broken into our world. People notice, and things change.