What is the title of C.S. Lewis’s 1943 book arguing for a universal moral law?

C.S. Lewis’s 1943 book arguing for a universal moral law is The Abolition of Man. The work developed from three lectures Lewis delivered at the University of Durham in February 1943.

Lewis examines education, moral judgment, and the danger of treating values as merely subjective feelings. He uses the term “the Tao” for a cross-cultural tradition of basic moral principles, while warning that attempts to eliminate objective value could undermine human dignity itself.

The book is often discussed alongside Lewis’s Christian apologetic works, but it is not a conventional devotional book. It is a compact work of moral philosophy and cultural criticism. Readers sometimes confuse it with The Problem of Pain, published in 1940, which addresses suffering and belief in God.