‘The problem you have put me will remain a problem till the globe of the world and the globe of the sun meet in their common center and the one consumes the other. This answer I have proposed, however, humanity will know and forget, know and forget, know and forget again. And that knowing and forgetting will approximate the peaks and depths of civilization as closely as the quotient of your tosses approximates that number which, rationally, we know is not there.’
Samuel R. Delany