Which book did C.S. Lewis publish in 1943 about the dangers of abandoning objective values?

The Abolition of Man is the C.S. Lewis book published in 1943 about the dangers of abandoning objective values. It developed from three lectures Lewis delivered at the University of Durham in 1943.

The book criticizes an approach to education and moral judgment that, in Lewis’s view, reduced value statements to expressions of personal feeling. He argues that traditions across cultures recognize a shared moral order, which he calls the Tao. His concern is that rejecting objective value would not make humanity more free; it could instead leave people vulnerable to manipulation by those who control social and technological power.

The work is philosophical rather than a novel or devotional narrative. Its title refers to the possibility that attempts to master nature may ultimately transform human nature itself. It is often read alongside Lewis’s essays on education, ethics, and modernity.