 As above, the theist will ultimately want to identify this necessary being with the ens realissimum, an identification which Kant thinks surreptitiously smuggles in the (dialectical) ontological argument. The claim here is that the proponent of the cosmological argument is committed ultimately to accepting the ontological argument, given her attempt to identify the necessary being with the ens realissimum. Although this suggests that the cosmological argument relies on the ontological, Kant also indicates that the effort to produce a purely a priori argument for God’s existence (the ontological argument) itself gets momentum from reason’s need to find the necessary ground for existence in general, a need expressed in the cosmological argument (cf. A603–04/B631–32). This suggests that Kant takes the ontological and cosmological arguments to be complementary expressions of the one underlying rational demand for the unconditioned.