Like such titles as Christian and Quaker, "anarchist" was in the end proudly adopted by one of those against whom it had been used in condemnation. In 1840, Pierre-Joseph Proudhon, that stormy, argumentative individualist who prided himself on being a man of paradox and a provoker of contradiction, published the work that established him as a pioneer libertarian thinker.In the same book he became the first man willingly to claim the title of anarchist.The passages in which he introduces "anarchist" and "anarchy" are historically important enough to merit quotation, since they not merely show these words being used for the first time in a socially positive sense, but also contain in germ the justification by natural law which anarchists have in general applied to their arguments for a non-authoritarian society.
Pierre-Joseph Proudhon