'Two things', wrote Kant, 'fill the mind with ever new and increasing admiration and the starry heavens above and the moral law within'. Many would argue that since Kant's day, the study of the starry heavens has advanced while ethics has stagnated, and in particular that Kant's ethics offers an empty formalism that tells us nothing about how we should live. In Acting on Principle Onora O'Neill shows that Kantian ethics has practical as well as philosophical importance. First published in 1975, the book is regarded as a classic account and defence of the Kantian ethical position. It addresses Kant's account of reasoning about action, in particular his controversial claim that the Categorical Imperative guides action and is basic to ethics and justice. This second edition offers a substantial new introduction and updated bibliography, and will be valuable for a wide readership in Kant studies and those studying ethics.
Onora Sylvia O'Neill, Baroness O'Neill of Bengarve CH CBE FBA FRS (born 23 August 1941) is a philosopher and a crossbench member of the House of Lords.
The daughter of Sir Con Douglas Walter O'Neill, she was educated partly in Germany and at St Paul's Girls' School, London before studying philosophy, psychology and physiology at Oxford University. She went on to complete a doctorate at Harvard University, with John Rawls as supervisor. During the 1970s she taught at Barnard College, the women's college in Columbia University, New York City. In 1977 she returned to Britain and took up a post at the University of Essex; she was Professor of Philosophy there when she became Principal of Newnham College, Cambridge in 1992.
She is an Emeritus Professor of Philosophy at the University of Cambridge, a former President of the British Academy 1988–1989 and chaired the Nuffield Foundation 1998–2010. In 2003, she was the founding President of the British Philosophical Association (BPA). In 2013 she held the Spinoza Chair of Philosophy at the University of Amsterdam. Until October 2006, she was the Principal of Newnham College, Cambridge, and she currently chairs the Equality and Human Rights Commission.