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.

Yahweh demanded justice for the poor, compassion and equality for foreigners and refugees, systemic redress for poverty, structural mechanisms to protect the homeless and family-less from abuse and destitution, fair and equitable distribution of land, integrity in the judicial system, humility, simplicity and morality in the government (as opposed to wealth, women and weapons), etc. etc. If you want that kind of society, you need to be faithful to the living God.

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.

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.

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.

I agree that we should regard all books of the Bible as equally inspired - and important. But some come into sharp focus at certain times, as particularly relevant and sharp in what they have to say to our culture at any given moment of history. And Jeremiah is a book for our times.