1. You will be my witnesses (6-8)
The disciples dreamed of an earthly, restored kingdom of Israel. They thought that Jesus' resurrection meant that the time had come. But God's kingdom is spiritual; it includes people of every nation, race and language. It would come at God's appointed time, and they must participate in its coming until Jesus' return. When the gospel is preached and accepted, God's kingdom comes into the hearts of people. So disciples must be apostles, i.e., missionaries. They must witness to the risen Christ in Jerusalem (where Jesus was crucified), in Judea and Samaria (among their friends and neighbors), and to the ends of the earth (even Rome)--until the end of the age (Mt 28:18-20).
2. The ascension (9-11)
The ascension of Jesus into heaven is the water-shed of Jesus' ministry. From this time, he would work from heaven through his disciples and the Holy Spirit. He will come again in clouds of glory to bring in the end of the age.
Application: Lord, help me to witness to your gospel until you come again.
One Word: Go. Be Jesus' witnesses