My own conclusion is that history is simply social development along the lines of weakest resistance, and that in most cases the line of weakest resistance is found as unconsciously by society as by water.
Charles Sumner's mind had reached the calm of WATER which receives and reflects images without absorbing them; it contains nothing but itself.
American society is a sort of flat, fresh-water pond which absorbs silently, without reaction, anything which is thrown into it.