Political theory has long questioned the nature and rights of the state. Some forms of corporatism extol the moral position that the corporate group, usually the state, is greater than the sum of its parts and that individuals have a moral obligation to serve the state. Skepticism towards statism in Western cultures is largely rooted in Enlightenment philosophy. John Locke notably influenced modern thinking in his writings published before and after the English Revolution of 1688, especially "A Letter Concerning Toleration" (1667), "Two Treatises of Government" (1689) and "An Essay Concerning Human Understanding" (1690). In the text of 1689, he established the basis of liberal political theory, i.e., that people's rights existed before government; that the purpose of government is to protect personal and property rights; that people may dissolve governments that do not do so; and that representative government is the best form to protect rights.