 Kant further contends that the Cosmological Argument is parasitic on the Ontological. He demonstrates this by taking Leibniz’s Modal Argument as emblematic of all other Cosmological Arguments and then contends that a being posited as necessary in order to explain the contingency of creation has built into it the same error as discussed above. According to Leibniz’s Modal Argument, the existence of a contingent reality can only be ultimately explained through a cause whose existence is in itself necessary. However, something whose existence is in itself necessary is something whose existence cannot depend upon anything else but itself, its own nature. This returns us to the Ontological Argument, or at least the objectionable idea at its heart, for the necessary being that the Cosmological Argument proposes is also the idea of a being whose essence involves existence. So, as before, since existence is not a predicate, Kant rejects the coherence of the idea of a being whose existence depends upon nothing but its own nature.