"The presence of different nations under the same sovereignty...provides against the servility which flourishes under the shadow of a single authority. ... Liberty provokes diversity, and diversity preserves liberty by supplying the means of organisation. ... This diversity in the same State is a firm barrier against the intrusion of the government beyond the political sphere which is common to all into the social department which escapes legislation and is ruled by spontaneous laws. This sort of interference is characteristic of an absolute government, and is sure to provoke a reaction, and finally a remedy. That intolerance of social freedom which is natural to absolutism is sure to find a corrective in the national diversities, which no other force could so efficiently provide. The co-existence of several nations under the same State is a test, as well as the best security of its freedom. It is also one of the chief instruments of civilisation; and, as such, it is in the natural and providential order, and indicates a state of greater advancement than the national unity which is the ideal of modern liberalism."