Øjvind Larsen’s topics are first of all ethics, political philosophy and moral sociology. Throughout his career, he has studied ethical problems from many perspectives. He started as a theologian where his main interest was the ethical consequences of Christianity from an existentialist perspective. Influenced by the social and political movements in 1968, his scope changed to a social perspective and here he found it difficult, not to say impossible to sustain this new perspective on the grounds of a theological justification. Strongly influenced by Marx’s theories on politics, economy and history, he went on with studies in sociology and history. In the end, this Marxist perspective became a cul-de-sac and therefore it was a help to study Max Weber’s sociological theory and especially his studies of the protestant ethic and the spirit of capitalism. This became Larsen’s way to a new perspective because Weber could explain the rationalization and the modernization of society not only as a process of change in the production relations but also as a change in the horizon of understanding of social relations and society. In his dissertation The Right to Dissent – The Critical Principle of Discourse Ethics and Deliberative Democracy, Larsen set about studying Habermas’s theory of communicative action as a critique of Weber’s limited understanding of rationalization, which is a technical-instrumental form of rationalization of European society. Habermas claims that modern society has potential for a more fundamental form of rationalization, which consists of empowering the good argument in dialogue. This potential has a huge impact on the understanding of modern communicative ethics, politics and deliberative democracy.