But his genetic and physical inference from cases of ethnic durability cannot account for the considerable variability, wide range and frequent absorptions and dissolutions of instances of ethnic affiliation, and the fact that many ethnies have undergone large-scale changes of culture and, in some cases, of demography. This is the case even in such a culturally long-lived example as the Greeks, where undoubted evidence of massive rupture of demographic continuity by the influx of Albanians and Slavs on the Greek mainland from the sixth to eighth centuries AD and of considerable, though not complete, culture change after the conversion to Orthodoxy, call into question the continuity and influence of a common ancient Greek biological and genetic inheritance on modern Greeks.
For perennialists, too, the nation is immemorial. National forms may change and particular nations may dissolve, but the identity of a nation is unchanging. Yet the nation is not part of any natural order, so one can choose one's nation, and later generations can build something new on their ancient ethnic foundations. The task of nationalism is to rediscover and appropriate a submerged past in order the better to build on it.
In each case, the concept of chosenness played a central role. For Greeks and Armenians, the myth of ethnic election was both direct and transmitted. It was an act of God who had singled out a special community of His faithful to live according to His holy laws and receive His special blessings, the blessings being conditional on the holding of correct beliefs and the performance of sacred obligations. As with the Jews, the overriding purpose was to become a holy people beloved of God, a people of priests worthy of the status and location which God had bestowed on the community. But, unlike the Jews, Armenians and Greeks saw their election as a reward for receiving the true faith rejected by the Jews. They were therefore required to supplant the Jews as the chosen people, and become the heirs of a people who had fallen from grace. In this sense, the chosen status of Greeks and Armenians was a legacy from the Jewish people, and only much later did the Orthodox community of true believers become imbued with Greek culture and a sense of Greek-speaking community, and to the outside world Orthodoxy became synonymous with Greek culture and origins.