"This terrible subject would require a book to itself. Here it will be enough to say that the Heavenly Society is also an earthly society. Our (merely natural) patriotism towards the latter can very easily borrow the transcendent claims of the former and use them to justify the most abominable actions. If ever the book which I am not going to write is written, it must be the full confession by Christendom of Christendom's specific contribution to the sum of human cruelty and treachery. Large areas of the World will refuse to hear us till we have publicly disowned much of our past. Why should they? We have shouted the name of Christ and enacted the service of Moloch."
— C.S. Lewis, The Four Loves
"Christendom might quite reasonably have been alarmed if it had not been attacked. But as a matter of history it had been attacked. The Crusader would have been quite justified in suspecting the Moslem even if the Moslem had merely been a new stranger; but as a matter of history he was already an old enemy. The critic of the Crusade talks as if it had sought out some inoffensive tribe or temple in the interior of Thibet, which was never discovered until it was invaded. They seem entirely to forget that long before the Crusaders had dreamed of riding to Jerusalem, the Moslems had almost ridden into Paris."
— G.K. Chesterton, The New Jerusalem (1920)
"Essentially, the Crusades consisted of Europe beating up Jerusalem and stealing its homework for a few generations."