Which C.S. Lewis book argues that human values cannot be reduced to subjective preference?

The Abolition of Man argues that human values cannot be reduced to subjective preference.

Published in 1943, the book developed from three lectures Lewis gave at the University of Durham in 1943. He criticized an approach to education that, in his view, treated value judgments as merely expressions of emotion. Lewis argued instead for an objective moral order, which he called the Tao.

The final section warns that attempts to control nature through technology can ultimately become attempts by some humans to control other humans. The title does not mean the physical extinction of humanity alone; it also refers to the possible loss of shared moral judgment and human nature. The work remains a major example of Lewis’s moral and cultural criticism.