Viewed in this light, violent devastations, which have for a time, perhaps, arrested the progressive development of a people, will appear to have ultimately founded and educed purer and more wholesome manners and customs. Severe shocks are now and then as useful for the general welfare of a nation as a violent fit of sickness for the health of an individual, or storms for the purification of an oppressive atmosphere. The germ of a higher civilization was first implanted in the rude and warlike tribes, which then predominated throughout Europe, by the Greeks and Romans. The bold expeditions of the latter, in particular, introduced the arts and sciences into the countries north of the Alps; and it was from the south that even the Christian religion began its progress. But before Christianity could take firm root among the European tribes, before a really Christian state could be founded, it was necessary that an immense revolution should take place. Heathenism and barbarism then collected all their strength in order to destroy Roman power and Roman civilization. The Roman Empire, and with it almost all the older states, was overthrown by the vast national migrations; and a new and different population, with which a fresh civilization was to begin, spread itself over Europe. It was these migrations that brought the Anglo-Saxons into England, after they had abandoned their ancient habitations on the south and south-west shores of the Baltic; whence they were expelled by the advancing Slavonic tribes of the Wends, or Vandals. Contemporaneously with the diffusion of Christianity in the south and west of Europe, larger Christian states gradually arose. Charlemagne had already, about the year 800, founded an immense kingdom; and, in order to strengthen it both against inward disturbances and outward attacks, had established apparently durable institutions. But as it was too often necessary, in those early times, to force Christianity on the people by dint of arms, without seeking any real support for it in their convictions and belief—a circumstance that rendered prevalent a very great moral relaxation, and even wickedness—they were thus induced to regard the political institutions which sprang from it as something foreign, which neither proceeded from themselves, nor possessed any intrinsic strength. Both Church and State tottered. The whole structure of Christian communities was in its weak and early childhood; and it was not till the people had been convinced of its necessity, by their calamities and sufferings, that Christianity was able to gain a really firm footing.