Which C.S. Lewis book argues that humanity must accept objective moral values?

The Abolition of Man argues that humanity must accept objective moral values.

Published in 1943, The Abolition of Man developed from three lectures Lewis gave at the University of Durham. The book criticizes an approach to education that, in his view, treats value judgments as merely subjective emotional responses. Lewis argues instead for a shared moral order that he calls the Tao.

The work has three chapters: “Men Without Chests,” “The Way,” and “The Abolition of Man.” Lewis’s central warning is that attempts to conquer nature through technological power can ultimately reduce human freedom and moral agency if they reject objective value.

The book is often confused with Mere Christianity, which presents a broader case for Christian belief, or Miracles, which addresses the supernatural. The Abolition of Man is the specifically focused work on moral education, natural law, and the consequences of denying objective values.