If "gospel" means good news, then Jeremiah had some for sure. He saw the judgment coming, in horrifying technicolour. But he saw beyond it to the redeeming, restoring grace of God, and indeed he speaks of the "new covenant", which takes us to the heart of the gospel in Christ.

Only the gospel exposes the cancer of idolatry.

What is so striking in the book of Jeremiah is how many times it is impossible to distinguish between the words of Jeremiah and the words of God, when deep feelings are being expressed. That is probably intentional. The prophet not only speaks what God says, he also feels what God feels. The tears of the prophet are the tears of God.

Old Testament Israel had some foundational pillars of faith. They were true and robust and God given. The trouble was that people had come to trust in them merely by repeating them, without paying any attention to the ethical implications of what their faith should mean in how they lived. They believed God had given them their land. He had. But they had not lived in it in either gratitude or obedience. They had not fulfilled any of the conditions that Deuteronomy had made so clear.

Mission means inviting all the peoples of the earth to hear the music of God's future and dance to it today.

As Paul says, even though we as human beings know God, we refuse to acknowledge him. That's what Peter did. He refused even to "know" Jesus! Peter's failure reflects all our failure. It forces us to face the reality about ourselves. But the point of the story is that Jesus foretold this - he knew it was coming. And Jesus forgave Peter, when Peter confessed his love for Jesus. So the story illustrates both the horrible nature of sin, and the amazing reality of grace. That's essential to the whole meaning of the gospel.

The whole earth, then, belongs to Jesus. It belongs to him by right of creation, by right of redemption and by right of future inheritance - as Paul affirms in the magnificent cosmic declaration of Colossians 1:15-20. So wherever we go in his name, we are walking on his property. There is not an inch of the planet that does not belong to Christ. Mission then is an authorized activity carried out by tenants on the instructions of the owner of the property.