[js1138]

I think we ought to collect up the sort of rationally obtained knowledge which is denied here, and preserve it for future generations to rediscover after the end of the coming Second Dark Ages.

Try A Canticle For Liebowitz.

[PatrickHenry]

[Concerning the coming Second Dark Ages] Try A Canticle For Liebowitz.

As with most such SF topics, Heinlein did it earlier. And perhaps better. I think it was "Revolt in 2100."