(Jackson. Classical and modern thought on international relations: from anarchy to Cosmopolis.) The idea of ​​a global unity of human beings as a single species living in a world society – along with the notions of universal law and harmony was expressed and transformed by many cosmopolitans of the Enlightenment – ​​including Jeremy Bentham, David Hume and Adam Smith, but it is widely accepted that Immanuel's legacy Kant is the most significant in terms of cultivation. Kant blended elements of republicanism and liberalism with a sense of moral universalism that forced individuals to think as citizens of the world. As a moral being, each individual has the duty to obey and understand the bonds and principles that unite him to other human beings. Kant's theory of morality is summed up in the statement: “treat everyone as an end in themselves and not as a means to an objective”.