 The agent-centered deontologist can cite Kant’s locating the moral quality of acts in the principles or maxims on which the agent acts and not primarily in those acts’ effects on others. For Kant, the only thing unqualifiedly good is a good will (Kant 1785). The patient-centered deontologist can, of course, cite Kant’s injunction against using others as mere means to one’s end (Kant 1785). And the contractualist can cite, as Kant’s contractualist element, Kant’s insistence that the maxims on which one acts be capable of being willed as a universal law—willed by all rational agents (Kant 1785). (See generally the entry on  Kant.)