Which C.S. Lewis book argues that modern society needs a shared moral law?

C.S. Lewis’s The Abolition of Man argues that education and society require a shared moral law. The book originated as three lectures delivered at the University of Durham in February 1943 and was published later that year.

Lewis criticizes an approach to education that treats moral judgments as merely subjective feelings. He presents what he calls the Tao, a term he uses for a cross-cultural tradition of objective moral principles. His argument is that abandoning such principles does not make humans more free; instead, it risks allowing one group to manipulate another.

The book is often grouped with Lewis’s Christian apologetic works, but its focus is broader than a defense of Christianity. It addresses education, ethics, reason, and the long-term consequences of treating values as arbitrary.