Stalin: The theoretical basis of scientific socialism is the materialist theory of Marx and Engels. From the standpoint of this theory the development of social life is wholly determined by the development of the productive forces. If the feudal-landlord system was superseded by the bourgeois system, the "blame" for this rests upon the development of the productive forces, which made the rise of the bourgeois system inevitable. Or again: if the present bourgeois system will inevitably be superseded by the socialist system, it is because this is called for by the development of the modern productive forces. Hence the historical necessity of the destruction of capitalism and the establishment of socialism. Hence the Marxist proposition that we must seek our ideals in the history, of the development of the productive forces and not in the minds of men. https://wordsmith.social/protestation/quotes#quote9319