And the point, putting together Acts 1 and 2, is this: Jesus and his people together constitute the new Temple, the heaven-and-earth place, the launching of new creation. Tom Wright

The New Testament declares that God has come back at last. In Jesus, God has come back to judge and to rescue. In the spirit, God has come back to dwell in and with his people – as the advance sign and means of his eventual filling of all creation with his presence and love. Tom Wright

So the point of Pentecost is not simply God giving his people a fresh injection of spiritual energy so that they can evangelise, teach, perform remarkable healings and so on. The point is the homecoming of God: God is doing at last what he had long intended and promised. Tom Wright