Here is Engels' argument: 'That force, however, plays yet another role other than that of a diabolical power in history, a revolutionary role; that, in the words of Marx, it is the midwife of every old society which is pregnant with the new; that it is the instrument by the aid of which the social movement forces its way through and shatters the dead, fossilized, political forms of this there is not a word in Herr hring.