" the unity of history'-involving the assumption that there is only one river of civilization, our own, and that all others are either tributary to it or else lost in the desert sands- may be traced to three roots: the egocentric illusion, the illusion of the 'unchanging East', and the illusion of progress as a movement that proceeds in a straight line. "

― Arnold Joseph Toynbee , A Study of History, Abridgement of Vols 1-6