To revolt is a natural tendency of life. Even a worm turns against the foot that crushes it. In general, the vitality and relative dignity of an animal can be measured by the intensity of its instinct to revolt.
"On the International Workingmen's Association and Karl Marx" by Mikhail Bakunin (1872), as quoted in Mikhail Bakunin "Bakunin on Anarchism" edited and translated by Sam Dolgoff, www.marxists.org. 1971.