In St. Thomas Aquinas legt Chesterton uit waarin christendom en islam verschillen in hun houding ten opzichte van algemeen-menselijke beginselen en filosofie:
The panic upon the Aristotelian peril, that had passed across the high places of the Church, was probably a dry wind from the desert. It was really filled rather with fear of Mahomet than fear of Aristotle. And this was ironic, because there was really much more difficulty in reconciling Aristotle with Mahomet than in reconciling him with Christ. Islam is essentially a simple creed for simple men; and nobody can ever really turn pantheism into a simple creed. It is at once too abstract and too complicated. There are simple believers in a personal God; and there are atheists more simple-minded than any believers in a personal God. But few can, in mere simplicity, accept a godless universe as a god. And while the Moslem, as compared with the Christian, had perhaps a less human God, he had if possible a more personal God. The will of Allah was very much of a will, and could not be turned into a stream of tendency. On all that cosmic and abstract side the Catholic was more accommodating than the Moslem--up to a point. The Catholic could admit at least that Aristotle was right about the impersonal elements of a personal God. Hence, we may say broadly of the Moslem philosophers, that those who became good philosophers became bad Moslems. It is not altogether unnatural that many bishops and doctors feared that the Thomists might become good philosophers and bad Christians. But there were also many, of the strict school of Plato and Augustine, who stoutly denied that they were even good philosophers. Between those rather incongruous passions, the love of Plato and the fear of Mahomet, there was a moment when the prospects of any Aristotelian culture in Christendom looked very dark indeed. Anathema after anathema was thundered from high places; and under the shadow of the persecution, as so often happens, it seemed for a moment that barely one or two figures stood alone in the storm-swept area. They were both in the black and white of the Dominicans; for Albertus and Aquinas stood firm.
In that sort of combat there is always confusion; and majorities change into minorities and back again, as if by magic. It is always difficult to date the turn of the tide, which seems to be a welter of eddies; the very dates seeming to overlap and confuse the crisis. But the change, from the moment when the two Dominicans stood alone to the moment when the whole Church at last wheeled into line with them, may perhaps be found at about the moment when they were practically brought before a hostile but a not unjust judge. Stephen Tempier, the Bishop of Paris, was apparently a rather fine specimen of the old fanatical Churchman, who thought that admiring Aristotle was a weakness likely to be followed by adoring Apollo. He was also, by a piece of bad luck, one of the old social conservatives, who had intensely resented the popular revolution of the Preaching Friars. But he was an honest man; and Thomas Aquinas never asked for anything but permission to address honest men. All around him there were other Aristotelian revolutionaries of a much more dubious sort. There was Siger, the sophist from Brabant, who learned all his Aristotelianism from the Arabs; and had an ingenious theory about how an Arabian agnostic could also be a Christian. There were a thousand young men of the sort that had shouted for Abelard; full of the youth of the thirteenth century and drunken with the Greek wine of Stagira. Over against them, lowering and implacable, was the old Puritan party of the Augustinians; only too delighted to class the rationalistic Albert and Thomas with equivocal Moslem meta-physicians.
It would seem that the triumph of Thomas was really a personal triumph. He withdrew not a single one of his propositions; though it is said that the reactionary Bishop did condemn some of them after his death. On the whole, however, Aquinas convinced most of his critics that he was quite as good a Catholic as they were. There was a sequel of squabbles between the Religious Orders, following upon this controversial crisis. But it is probably true to say that the fact, that a man like Aquinas had managed even partially to satisfy a man like Tempier, was the end of the essential quarrel. What was already familiar to the few became familiar to the many; that an Aristotelian could really be a Christian.