These proto-capitalist and capitalist classes are driven by the profit motive but are prevented from developing further profits by the nature of feudal society where, for instance, the serfs are tied to the land and cannot become industrial workers and wage earners. Marx says, Then begins an epoch of social revolution (the French Revolution of 1789, the English Civil War and the Glorious Revolution of 1688, etc.) since the social and political organization of feudal society (or the property relations of feudalism) is preventing the development of the capitalists' productive forces.[4]