That this purely Christian dogma actually for a second time rebelled against the Empire, and actually for a second time refounded the Church in spite of the Empire, is itself a proof that there was something positive and personal working in the world, other than whatever official faith the Empire chose to adopt. This power utterly destroyed the official faith that the Empire did adopt. It went on its own way as it is going on its own way still. There are any number of other examples in which is repeated precisely the same process we have reviewed in the case of the Manichean and the Arian. A few centuries afterwards, for instance, the Church had to maintain the same Trinity, which is simply the logical side of love, against another appearance of the isolated and simplified deity in the religion of Islam. Yet there are some who cannot see what the Crusaders were fighting for; and some even who talk as if Christianity had never been anything but a form of what they call Hebraism coming in with the decay of Hellenism. Those people must certainly be very much puzzled by the war between the Crescent and the Cross. If Christianity had never been anything but a simpler morality sweeping away polytheism, there is no reason why Christendom should not have been swept into Islam. The truth is that Islam itself was a barbaric reaction against that very humane complexity that is really a Christian character; that idea of balance in the deity, as of balance in the family, that makes that creed a sort of sanity, and that sanity the soul of civilisation. And that is why the Church is from the first a thing holding its own position and point of view, quite apart from the accidents and anarchies of its age. That is why it deals blows impartially right and left, at the pessimism of the Manichean or the optimism of the Pelagian. It was not a Manichean movement because it was not a movement at all. It was not an official fashion because it was not a fashion at all. It was something that could coincide with movements and fashions, could control them and could survive them.