Because Roman civilization perished through barbarian...

Because Roman civilization perished through barbarian invasions, we are perhaps too much inclined to think that that is the only way a civilization can die. If the lights that guide us ever go out, they will fade little by little, as if of their own accord.... We therefore should not console ourselves by thinking that the barbarians are still a long way off. Some peoples may let the torch be snatched from their hands, but others stamp it out themselves.