What must it have been like to be there, as the resurrected Jesus spoke those words and ascended into heaven?
Having been called by Jesus to follow him, the apostles are now called to go and make disciples. The call is to go to all nations, the tools of discipleship are baptism and the teaching of Jesus. But the resources they need are found, as ever in Jesus, who has been given all authority in heaven and on earth by the Father. More than that, Jesus promises that, as they go, he will always be with them.
These words, of course, come down the centuries to us. Jesus, who called us to follow him, calls us too to go and make disciples. The tools and the resources the same, with the same empowering promise that Jesus is with us as we go.