 Kant’s most famous criticism of the ontological argument is encapsulated in his claim that “existence” (or “exists”) is not a positive determination or “real predicate” (Kant 1781/1787: A592/B619ff). Alternatively, “existence” is not “a predicate that is added to the concept of the subject and enlarges it” (A598/B626; see Stang 2016 and Pasternack 2018 for discussion). Kant’s idea here is that since “existence” is not a real predicate, existing cannot be one of God’s perfections. 