" What is now recognized as true also has its hidden false side which will later manifest itself, just as what is now recognized as false also has its true side, by virtue of which it could previously be regarded as true; that what is maintained to be necessary is composed of sheer contingencies, and that the so-called accidental is the form behind which necessity hides itself - and so on. "

― Friedrich Engels , Ludwig Feuerbach and the Outcome of Classical German Philosophy