What is it about leadership and messianic complexes or the belief we can hasten God’s plans?

All streams of Islam believe in a divine saviour, known as the Mahdi, who will appear at the End of Days. A common rumour - denied by the government but widely believed - is that Mr Ahmadinejad and his cabinet have signed a “contract” pledging themselves to work for the return of the Mahdi and sent it to Jamkaran.

Iran’s dominant “Twelver” sect believes this will be Mohammed ibn Hasan, regarded as the 12th Imam, or righteous descendant of the Prophet Mohammad.

He is said to have gone into “occlusion” in the ninth century, at the age of five. His return will be preceded by cosmic chaos, war and bloodshed. After a cataclysmic confrontation with evil and darkness, the Mahdi will lead the world to an era of universal peace.

This is similar to the Christian vision of the Apocalypse. Indeed, the Hidden Imam is expected to return in the company of Jesus.

Mr Ahmadinejad appears to believe that these events are close at hand and that ordinary mortals can influence the divine timetable.

The prospect of such a man obtaining nuclear weapons is worrying. The unspoken question is this: is Mr Ahmadinejad now tempting a clash with the West because he feels safe in the belief of the imminent return of the Hidden Imam? Worse, might he be trying to provoke chaos in the hope of hastening his reappearance?

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