This world has seen a great many civilizations. And many of them have survived for longer periods than ours up to the present. They were all as sure as we are today of having founded the first eternal civilization. We today differ from them in having our western civilization spread to embrace the entire planet, leaving no room on any continent for any other culture to take over if we fail.
Source: Green Was the Earth on the Seventh Day
Contributed by: bajarbattu