What was the meaning of all that dim but vast unrest of the twelfth century; when, as it has been so finely said, Julian stirred in his sleep? Why did there appear so strangely early, in the twilight of dawn after the Dark Ages, so deep a scepticism as that involved in urging nominalism against realism? For realism against nominalism was really realism against rationalism, or something more destructive than what we call rationalism. The answer is that just as some might have thought the Church simply a part of the Roman Empire, so others later might have thought the Church only a part of the Dark Ages. The Dark Ages ended as the Empire had ended; and the Church should have departed with them, if she had been also one of the shades of night. It was another of those spectral deaths or simulations of death. I mean that if nominalism had succeeded, it would have been as if Arianism had succeeded; it would have been the beginning of a confession that Christianity had failed. For nominalism is a far more fundamental scepticism than mere atheism. Such was the question that was openly asked as the Dark Ages broadened into that daylight that we call the modern world. But what was the answer? The answer was Aquinas in the chair of Aristotle, taking all knowledge for his province; and tens of thousands of lads, down to the lowest ranks of peasant and serf, living in rags and on crusts about the great colleges, to listen to the scholastic philosophy.
What was the meaning of all that whisper of fear that ran round the West under the shadow of Islam, and fills every old romance with incongruous images of Saracen knights swaggering in Norway or the Hebrides? Why were men in the extreme West, such as King John if I remember rightly, accused of being secretly Moslems, as men are accused of being secretly atheists? Why was there that fierce alarm among some of the authorities about the rationalistic Arab version or Aristotle? Authorities are seldom alarmed like that except when it is too late. The answer is that hundreds of people probably believed in their hearts that Islam would conquer Christendom; that Averroes was more rational than Anselm; that the Saracen culture was really, as it was superficially, a superior culture. Here again we should probably find a whole generation, the older generation, very doubtful and depressed and weary. The coming of Islam would only have been the coming of Unitarianism a thousand years before its time. To many it may have seemed quite reasonable and quite probable and quite likely to happen. If so, they would have been surprised at what did happen. What did happen was a roar like thunder from thousands and thousands of young men, throwing all their youth into one exultant counter-charge; the Crusades. It was the sons of St. Francis, the Jugglers of God, wandering singing over all the roads of the world; it was the Gothic going up like a flight of arrows; it was the waking of the world. In considering the war of the Albigensians, we come to the breach in the heart of Europe and the landslide of a new philosophy that nearly ended Christendom for ever. In that case the new philosophy was also a very new philosophy; it was pessimism. It was none the less like modern ideas because it was as old as Asia; most modern ideas are. It was the Gnostics returning; but why did the Gnostics return? Because it was the end of an epoch, like the end of the Empire; and should have been the end of the Church. It was Schopenhauer hovering over the future; but it was also Manichaeus rising from the dead; that men might have death and that they might have it more abundantly.