Friedrich Engels Quote
By the same right under which France took Flanders, Lorraine and Alsace, and will sooner or later take Belgium — by that same right Germany takes over Schleswig; it is the right of civilization as against barbarism, of progress as against stability. Even if the agreements were in Denmark's favor — which is very doubtful-this right carries more weight than all the agreements, for it is the right of historical evolution.
The revolution of 1848-49: articles from the Neue rheinische Zeitung (ed. Intl Pub, 1972)