 Thus, although Kant is most well known for his attacks on the specific arguments for God’s existence, his criticisms of rational theology are in fact more detailed, and involve a robust critique of the idea of God itself. This account of the rational origin and the importance of the idea of God clears the way for Kant’s rejection of the metaphysical arguments about God’s existence. Kant identifies three traditional arguments, the ontological, the cosmological, and the physico-theological (the argument from design). What all such arguments do is attempt to wed the idea of the ens realissimum with the notion of necessary existence. Whereas the Ontological argument moves from the concept of the ens realissimum to the claim that such a being exists necessarily, the Cosmological and physico-theological arguments move from some necessary being to the conclusion that such a being must be the ens realissimum.