Over the past 10 days, like a submarine just below the surface, the outline has become visible of a massive Whitehall row, the outcome of which could be almost as important to our country as fixing the deficit.
The argument is about the influence that Islamism should have in the British state. Islamism should never, by the way, be confused with Islam. Islam is a religion, practised by millions of British citizens who have never sought to overthrow anything in their lives. Islamism is a revolutionary political doctrine, supported by a small minority of Muslims, whose aim is to overthrow secular democratic government and replace it with Islamic government.
In the words of Syed Mawdudi, its founder: "Wherever you are, in whichever country you live, you must strive to change the wrong basis of government, and seize all powers to rule and make laws from those who do not fear God."