We sometimes imagine, under the influence of Spenglerian philosophy or some other kind of "historical morphology," that we live in a similar age [to the Romans], the last witnesses of a condemned civilization. But condemned by whom? Not by God, but by some supposed "historical laws." For although we do not know any historical laws, we are in fact able of inventing them quite freely, and such laws, once invented, can then be realized in the form of self-fulfilling prophecies.

"Looking for the Barbarians"