The success of a policy of raison d’état depends above all on the ability to assess power relationships. Universal values are defined by their perception and are not in need of constant reinterpretation; indeed they are inconsistent with it. But determining the limits of power requires a blend of experience and insight, and constant adjustment to circumstance. In theory, of course, the balance of power should be quite calculable; in practice, it has proved extremely difficult to work out realistically. Even more complicated is harmonizing one’s calculations with those of other states, which is
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