Originally published as a contribution to a textbook of ethics for students of theology, this title propounds a philosophical ethics in continuity with Martin Luther's conception of the natural law. We find here the core idea from The Ethical Demand, that in our dealings with others we are faced with the demand that we take care of them, now conceptualised as the central tenet of an ontological ethics based on human interdependence as a fundamental condition of life. Later in his career, Logstrup developed a conception of what he called 'the sovereign expressions of life' - spontaneous other - regarding impulses or ways of conduct such as trust, sincerity, and compassion - and these are here described and determined in their relation to the ethical demand and moral norms. Furthermore, this text discusses a number of central ethical concepts such as duty, responsibility, will, and choice.