Abstract

In one of his precritical works, Kant defends, as “the only possible” way of demonstrating the existence of God, an argument from the nature of possibility. Whereas Leibniz had argued that possibilities must be thought by God in order to obtain the ontological standing that they need, Kant argued that at least the most fundamental possibilities must be exemplified in God. Here Kant’s argument is critically examined in comparison with its Leibnizian predecessor, and it is suggested that an argument combining the strengths of both of them has much to be said for it.