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 trouble today is that many Christians live in a kind of bubble of assumptions about what their Christianity means, especially if it places them comfortably among "the good guys," - assumptions that are likely to be drawn as much from folk-Christianity, surrounding political culture, popular pulp-books about the "End Times," or their favourite guru writer or therapist, than from sober and comprehensive reading of the Bible as a whole. Prophets and preachers have the unwelcome task of pricking that bubble with the sharpness of actual texts and teachings of the Bible itself.

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.

It's important, though, that there are not "four gospels." There is only one gospel: the good news of what God has done through Christ to save the world. But we read that one gospel in four complementary accounts: The gospel, according to Matthew, according to Mark, according to Luke, according to John.

The Jews believed they were the nation God had chosen among all the nations. And they were. But that did not give them immunity to God's judgment. Like the nations, they too would feel God's wrath if they refused to live in God's ways. Furthermore, God could deal with other nations in mercy as well as judgment. Jeremiah was full of surprises, as against the popular religious assumptions of his day. That's perhaps why some people, when they encountered Jesus, thought he was very like Jeremiah. He turned things upside down.

"It is finished" means that Jesus had accomplished all that God's mission had sent him to do. It did not merely mean that his life was over like, "I'm finished". It was a statement of achievement of purpose - God's purpose to deal with sin and guilt, to defeat all the powers of evil, to bring about the reconciliation of enemies, to defeat death itself, and to accomplish the reconciliation and liberation of the whole creation.

It is not so much the case that God has a mission for his church in the world, as that God has a church for his mission in the world. Mission was not made for the church; the church was made for mission - God’s mission.