Citizenship education, defined as learning to live together, requires agreement on certain common principles. One central purpose of a state education system is the transmission of common normative standards such as the human rights and fundamental freedoms that underpin liberal democratic societies. The paper identifies the conceptual roots of the Universal Declaration of Human Rights (UDHR) in the sociological concept of utopia and Enlightenment cosmopolitanism. In the UDHR, the vision of freedoms that may promote human flourishing provides a precise way of conceptualising limits on state power. Whilst human rights is not a general theory, the concept has the hugely beneficial property of enabling people whose value systems are diverse and apparently incompatible, nonetheless to recognise and accept common standards and principles that make living in society possible. The implications of this are that human rights education is rightfully recognised as an essential component of citizenship education.