In the posthumously published Theory of Property, he argued that "property is the only power that can act as a counterweight to the State." Hence, "Proudhon could retain the idea of property as theft, and at the same time offer a new definition of it as liberty. There is the constant possibility of abuse, exploitation, which spells theft. At the same time property is a spontaneous creation of society and a bulwark against the ever-encroaching power of the State."
