 Rational agents are guided by universal principles that they have legislated. However, this is not to say that particular agents arbitrarily determine the moral law; otherwise, evil people would not be bound by the moral law (Korsgaard 1996a: 234–235; O’Neill 2003c; Reath 2006: 112–113, 92–170; Korsgaard 2008: 207–229). On the contrary, the claim is that rational agents are guided by universal principles (Korsgaard 1996a: 36, 234–236; Korsgaard 2008: 207–229; Reath 2006: 112–113, 92–170). But the moral law obliges us only insofar as it is self-legislated. That is, one can autonomously act on the moral requirements only if one legislates them. Furthermore, universal principles guarantee that action is expressive of an agent’s integrity, rather than driven by unreflective preferences or desires. This is because universal principles are the constitutive principles of rational actions, on the Kantian view. Correspondingly, an agent that acts mindlessly or compulsively lacks the sort of integrity that is characteristic of rational agents. That said, it is possible for rational agents to act in the pursuit of desires, when they have survived due reflection. 