"Cultural xenophobia is a frequent sequel to a society's decline from cultural vigor. Someone has aptly called self-imposed isolation a fortress mentality. [Karen] Armstrong describes it as a shift from faith in logos, reason, with its future-oriented spirit, 'always. . . .seeking to know more and to extend. . . . areas of competence and control of the environment,' to mythos, meaning conservatism that looks backward to fundamentalist beliefs for guidance and a worldview."
Jane Jacobs in Dark Age Ahead