But retrogression was never yet the way of progress. It is probable, for instance, that the sanitation of the Middle Ages was very inadequate, and their meals sadly indigestible; and it would be useless to provoke a revolt of the nose and the stomach in order to satisfy a craving of the mind. An uncritical mediaevalism is the child of ignorance of the Middle Ages. Sick of vaunting national cultures, we may recur to an age in which they had not yet been born--the age of a single and international culture; but we must remember, all the same, that the strength of the Middle Ages was rooted in weakness. They were on a low stage of economic development; and it was precisely because they were on a low stage of economic development that they found it so easy to believe in the unity of civilization. Unity of a sort is easy when there are few factors to be united; it is more difficult, and it is a higher thing, when it is a synthesis of many different elements. The Middle Ages had not attained a national economy: their economy was at the best municipal, and for the most part only parochial. A national economy has a higher economic value than a municipal or parochial economy, because it means the production of a greater number of utilities at a less cost, and a richer and fuller life of the mind, with more varied activities and more intricate connexions. A national economy could only develop along with--perhaps we may say it could only develop through--a national system of politics; and the national State, which is with us to-day, and with some of whose works we are discontented, was a necessary condition of economic progress. With the coming of the national State the facile internationalism of the Middle Ages had to disappear; and as economics and politics ran into national channels, the life of the spirit, hitherto an international life, suffered the same change, and national religions, if such a thing be not a contradiction in terms, were duly born. But a national economy, a national State, a national Church were all things unknown to the Middle Ages. Its economy was a village economy: its mental culture was an international culture bestowed by a universal Church (a village culture there could not be, and with a universal Church the only possible culture was necessarily international); while, as for its politics, they were something betwixt and between--sometimes parochial, when a local feudal lord drew to himself sovereignty; sometimes national, when a strong king arose in Israel; and sometimes, under a Charlemagne, almost international.