In France, revolutionaries began using "anarchiste" in a positive light as early as September 1793. Pierre-Joseph Proudhon was the first self-proclaimed "anarchist" (a label he adopted in his treatise "What Is Property?") and is often described as the founder of modern anarchist theory. He developed the theory of spontaneous order in society in which organisation emerges without a central coordinator imposing its own idea of order against the wills of individuals acting in their own interests, saying: "Liberty is the mother, not the daughter, of order." Proudhon answers his own question in "What Is Property?" with the famous statement that "property is theft." He opposed the institution of decreed property ("proprietorship") in which owners have complete rights to "use and abuse" their property as they wish and contrasted this with usufruct ("possession") or limited ownership of resources only while in more or less continuous use. Proudhon wrote that "Property is Liberty" because it was a bulwark against state power.