 It is this general theory of reason, as a capacity to think (by means of “ideas”) beyond all standards of sense, and as carrying with it a unique and unavoidable demand for the unconditioned, that frames the Kantian rejection of metaphysics. At the heart of that rejection is the view that although reason is unavoidably motivated to seek the unconditioned, its theoretical efforts to achieve it are inevitably sterile. The ideas which might secure such unconditioned knowledge lack objective reality (refer to no object), and our misguided efforts to acquire ultimate metaphysical knowledge are led astray by the illusion which, according to Kant, “unceasingly mocks and torments us” (A339/B397).