Nations have always been conscious of the utility of acquiring general beliefs, and have instinctively understood that their disappearance would be the signal for their own decline. In the case of the Romans, the fanatical cult of Rome was the belief that made them masters of the world, and when the belief had died out Rome was doomed to die. As for the barbarians who destroyed the Roman civilisation,it was only when they had acquired certain commonly accepted beliefs that they attained a measure of cohesion and emerged from anarchy.