 The arguments of these philosophical anarchists take either an “a priori” or an “a posteriori” form (Simmons 2001, pp. 104–106). Arguments of the first kind maintain that it is impossible to provide a satisfactory account of a general obligation to obey the law. According to Robert Paul Wolff, the principal advocate of this view, there can be no general obligation to obey the law because any such obligation would violate the “primary obligation” of autonomy, which is “the refusal to be ruled” (1998 [1970], p. 18). As Wolff defines it, autonomy combines freedom with responsibility. To be autonomous, someone must have the capacity for choice, and therefore for freedom; but the person who has this capacity also has the responsibility to exercise it – to act autonomously. Failing to do so is to fail to fulfill this “primary obligation” of autonomy.