How radical was Jesus’ preaching to Repent, for the Kingdom of Heaven is at hand?

Imagine what it would be like, in Britain or the United States today, if, without an election or any other official mechanism for changing the government, someone were to go on national radio and television and announce that there was now a new prime minister or president. “From today onward,” says the announcer, “we have a new ruler! We’re under new government! It’s all going to be different!” That’s not only exciting talk. It’s fighting talk. It’s treason! It’s sedition! By what right is this man saying this? How does he think he’ll get away with it? What exactly does he mean, anyway? An announcement like this isn’t simply a proclamation. It’s the start of a campaign. When a regime is already in power and is simply transferring that power to the next person in line, you just announce that it’s happening. But if you make that announcement while someone else appears to be in charge, you are saying, in effect, “The campaign starts here.”

N. T. Wright, Simply Jesus