How much does ethics demand of us? On what authority does it demand it? How does what ethics demand relate to other requirements, such as those of prudence, law, and social convention? Does ethics really demand anything at all? Questions of this sort lie at the heart of the work of the Danish philosopher and theologian K. E. Logstrup (1905-1981), and in particular his key text The Ethical Demand (1956). In The Radical Demand in Logstrup's Ethics,...