Caught in the relaxing interval between one moral code and the next, an unmoored generation surrenders itself to luxury, corruption, and a restless disorder of family and morals, in all but a remnant clinging desperately to old restraints and ways. Few souls feel any longer that "it is beautiful and honorable to die for one's country." A failure of leadership may allow a state to weaken itself with internal strife. At the end of the process a decisive defeat in war may bring a final blow, or barbarian invasion from without may combine with barbarism welling up from within to bring the civilization to a close.
- Will and Ariel Durant, The Lessons of History