Luke begins his second volume by telling his readers that what he recorded in his gospel was what “Jesus began to do and teach”. It is as if he is introducing a second installment of what Jesus goes on to do. We begin with Jesus teaching his disciples for 40 days about the kingdom of God. We note the emphasis is on the kingdom that Jesus has come to establish. His disciples are being reminded that they are to be citizens of this kingdom, living in the world but not of the world. Their participation in the kingdom of God will be made possible by the baptism of the Holy Spirit who is to live in them and transform them with power from on high.
“….you shall receive power when the Holy Spirit has come upon you; and you shall be my witnesses in Jerusalem and in all Judea and Samaria and to the end of the earth.”
As Jesus ascends to his throne angels appear to affirm the reality of the heavenly kingdom. The disciples response is to devote themselves to prayer, because prayer is the language of the kingdom. Luke 11 v 1-13, 19 v 46