“As man seeks justice in equality, so society seeks order in anarchy.”
Pierre Joseph Proudhon (1809–1865) French politician, mutualist philosopher, economist, and socialist
Source: What is Property? (1840), Ch. V, Part 2; this might be the ultimate inspiration of the later slogan coined in 1848 by Anselme Bellegarrigue (and often attributed to Proudhon): "Anarchy is order, government is civil war."