This essay is Locke's most famous work. It concerns that nature of human knowledge and understanding. It was one of the primary sources for empiricism, influenced many enlightenment philosophers like David Hume and Bishop Berkeley. The main thrust of the essay is that man does not have innate ideas or principals, that all are developed by experience. Volume one is devoted to disproving the theory of innate ideas. Volume two shows how ideas, principals, and morals are formed from experience.