 To illustrate, take two of the six candidates he discusses in the second Critique (5:39ff). One possibility would be a policy of following my inclinations wherever they might lead (Kant identifies this view with Epicurus). This is a policy of sorts, and indeed one that a free agent could adopt. But it goes beyond the “form of law” by taking substantive guidance from merely subjective factors. In doing so, it abandons law-likeness and intersubjective validity. Apart from the fact that my inclinations will surely change and clash, it is not a policy that everyone can follow: if they did, the results would be chaotic and defeat anyone’s attempts to satisfy their inclinations. (That is, it is non-universalizable in the sense that it leads to a “contradiction in the will.” While we can conceive of a world of such agents, we cannot consistently will such a world. See  Kant’s moral philosophy,  §5.) More abstractly, such a policy gives weight to the particular conditions of one particular agent. But those conditions can hardly claim the authority to guide others’ thought or action. So Kant says: