Friedrich Engels,
The origin of the family, private property…
(1909)
“ Barefaced covetousness was the moving spirit of civilization from its first dawn to the present day; wealth, and again wealth, and for the third time wealth; wealth, not of society, but of the puny individual, was its only and final aim. If nevertheless the advanced development of science, and at repeated times the highest flower of art, fell into its lap, this was only due to the fact that without them the highest emoluments of modern wealth would have been missing. Exploitation of one class by another being the basis of civilization, its whole development involves a continual contradiction. ”
