¹⁶Now the eleven disciples went to Galilee, to the mountain to which Jesus had directed them. ¹⁷When they saw him, they worshiped him; but some doubted. ¹⁸And Jesus came and said to them, “All authority in heaven and on earth has been given to me. ¹⁹Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, ²⁰and teaching them to obey everything that I have commanded you. And remember, I am with you always, to the end of the age.”

1. We are to make disciples. This has two clear components: baptising them — in the name of the trinity (note, not one) and teaching them (us) to obey all the commands Jesus said.
2. We are to make disciples of all nations. We are not to stick within our local culture and comfort, but we are to go out  If a nation loses its Christian witness, we are to … make disciples. We are not to give up on any people, even people who are now our enemies.
3. Jesus promises to be with the church to the end of the age. This implies that this is the final age — the age where the people of God expand from Israel to all peoples. It also implies that he is coming back at the end of this time and confronts the dispensationalists with their theoretical model of the end.

And this is the work of the Church. If we lose sight of these goals, we are no longer Church, but some form of cultic club.  Dying and ineffective.