The English philosopher John Locke (1632–1704) developed the ideas of property, civil and political rights further. In his "Second Treatise on Civil Government" (1689), Locke proclaimed that "everyman has a property in his person; this nobody has a right to but himself. The labor of his body and the work of his hand, we may say, are properly his". He argued that property ownership derives from one's labor, though those who do not own property and only have their labor to sell should not be given the same political power as those who owned property. Labourers, small-scale property owners and large-scale property owners should have civil and political rights in proportion to the property they owned. According to Locke, the right to property and the right to life were inalienable rights and that it was the duty of the state to secure these rights for individuals. Locke argued that the safeguarding of natural rights, such as the right to property, along with the separation of powers and other checks and balances, would help to curtail political abuses by the state.