allowed by the virtuous individual as he attempts to meet the demands of the moral life courageously and joyously. G. W. F. Hegel German philosopher G. W. F. Hegel presented two main criticisms of Kantian ethics. He first argued that Kantian ethics provides no specific information about what people should do because Kant's moral law is solely a principle of non-contradiction. He argued that Kant's ethics lack any content and so cannot constitute a supreme principle of morality. To illustrate this point, Hegel and his followers have presented a number of cases in which the Formula of Universal Law either provides no meaningful answer or gives an obviously wrong answer. Hegel used Kant's example of being trusted with another man's money to argue that Kant's Formula of Universal Law cannot determine whether a social system of property is a morally good thing, because either answer can entail contradictions. He also used the example of helping the poor: if everyone helped the poor, there would be no poor left to help, so beneficence would be impossible if universalized, making it immoral according to Kant's model. Hegel's second criticism was that Kant's ethics forces humans into an internal conflict between reason and desire. Because it does not address the tension between self-interest and morality, Kant's ethics cannot give individuals any reason to be moral. Arthur Schopenhauer German philosopher Arthur Schopenhauer criticised Kant's belief that ethics should concern what ought to be done, insisting that the scope of ethics should be to attempt to explain and interpret what actually happens. Whereas Kant presented an idealized version of what ought to be done in a perfect world, Schopenhauer argued that ethics should instead be practical and arrive at conclusions that could work in the real world, capable of being presented as a solution to the world's problems. Schopenhauer drew a parallel with aesthetics, arguing that in both cases prescriptive rules are not the most important part of the discipline. Because he believed that virtue cannot be taught—a person is either virtuous or is not—he cast the proper place of morality as restraining and guiding people's behavior, rather than presenting unattainable universal laws. Friedrich Nietzsche Philosopher Friedrich Nietzsche criticised all contemporary moral systems, with a special focus on Christian and Kantian ethics. He argued that all modern ethical systems share two problematic characteristics: first, they make a metaphysical claim about the nature of humanity, which