The nineteenth century moved fast and furious, so that one who moved in it felt sometimes giddy, watching it spin; but the eleventh moved faster and more furiously still. The Norman conquest of England was an immense effort, and its consequences were far-reaching, but the first crusade was altogether the most interesting event in European history. Never has the western world shown anything like the energy and unity with which she then flung herself on the East, and for the moment made the East recoil. Barring her family quarrels, Europe was a unity then, in thought, will and object. Christianity was the unit.

Mont Saint Michel and Chartres (1904)