The English state was the only one which finally resolved the great debate of the Middle Ages by the principle of supremacy, that is, by refusing to recognise that there could be any power or right of human compulsion over its members which derived from a source outside the realm, or that there could be concurrent sources of compulsion within the realm. This solution reflects, and no doubt emphasises, a characteristic of this nation which differentiates it from other European nations on either side of the Atlantic more than we or they commonly recognise. On the European mainland and in America concurrence of powers and limitation of sovereignty are taken for granted; in Britain we simply do not imagine them... In the United Kingdom the ultimate sovereignty resides in one person, upon whose authority when in Parliament the law knows no limitations.