The relation between God and the highest good is the basis of Kant’s main argument for belief in God. (See Wood 1970.) The argument, most clearly articulated in the Critique of Practical Reason, goes like this (CPrR 5:110–14, 124–46). The moral law issues categorical demands through each agent’s own reason. If the moral law sets forth an end for us to promote, we must promote it. For our promotion of this end to be rational, the end must be one that we can rationally view as possible for us to p