Islam, or at least modern reinterpretations of it, is at the core of some of the Arabs' deep troubles. The faith's claim, promoted by many of its leading lights, to combine spiritual and earthly authority, with no separation of mosque and state, has stunted the development of independent political institutions. A militant minority of Muslims are caught up in a search for legitimacy through ever more fanatical interpretations of the Koran. Other Muslims, threatened by militia violence and civil war, have sought refuge in their sect. In Iraq and Syria plenty of Shias and Sunnis used to marry each other; too often today they resort to maiming each other. And this violent perversion of Islam has spread to places as distant as northern Nigeria and northern England.

Today the outlook is bloody. But ultimately fanatics devour themselves. Meanwhile, wherever possible, the moderate, secular Sunnis who comprise the majority of Arab Muslims need to make their voices heard. And when their moment comes, they need to cast their minds back to the values that once made the Arab world great. Education underpinned its primacy in medicine, mathematics, architecture and astronomy. Trade paid for its fabulous metropolises and their spices and silks. And, at its best, the Arab world was a cosmopolitan haven for Jews, Christians and Muslims of many sects, where tolerance fostered creativity and invention.

The tragedy of the Arabs