Abstract

This chapter examines the thought expressed in 'A Lecture on Ethics', and considers the indirect applications of Wittgenstein's later philosophy to ethics. It focuses on the only passage in Philosophical Investigations in which Wittgenstein has something explicitly to say about ethical concepts. Nevertheless, the later philosophy of Philosophical Investigations and other works exerted an enormous influence on ethical thinkers, resulting in a number of treatises that speak directly to ideas central to the later philosophy. This influence is especially felt in the emotivism and prescriptivism of mid‐twentieth‐century ethical theory, although at points the influence of Wittgenstein's earlier philosophizing and his philosophy of language is apparent as well in these “non‐cognitivist” theories. G.E. Moore began contemporary linguistic ethics when he asked what is good. He denied that the term 'good' could be defined, on the grounds that it refers to a simple, indefinable, nonnatural moral quality.