"Marx saw the coming of communism (in his sense) as the result of a long series of struggles, transforming conditions and men. The kind of society he envisioned required, as Lenin observed, "a person not like the present man on the street." Marx saw this new sort of person emerging as a natural result of the sobering process of a social struggle lasting perhaps a half-century. The educational role of adversity and setbacks for the proletariat was a recurrent theme in the writings of Marx and Engles. Lenin, on the other hand, believed that the proletariat would never automatically the necessary class outlook and purposeful unity: "Class political consciousness can be brought to the working class only from without." Whatever the relative merits, in terms of realism, of the Marxist verses the Leninist conceptions of the working class, this crucial shift of assumptions necessitated a fundamental change, however covert, in the line of march towards communism, both before and after the seizure of power [by Lenin and the Bolsheviks]."