Which C.S. Lewis book is a philosophical defense of objective moral values?

The Abolition of Man is C.S. Lewis’s philosophical defense of objective moral values. The book originated as three lectures delivered at the University of Durham in 1943 and was published later that year.

Lewis argues that education should cultivate rational judgment and moral feeling rather than treating value statements as merely subjective reactions. He calls the traditional framework of objective moral principles the Tao, using the term broadly for shared moral insight across cultures.

The work is often remembered for its warning about attempts to reshape humanity through technological power without a corresponding moral framework. It is not a novel, unlike The Pilgrim’s Regress, and it is distinct from Lewis’s more directly theological books such as Miracles.