What was the title of C.S. Lewis’s 1943 book arguing that Christianity offers a unified moral framework?

C.S. Lewis’s 1943 book arguing for a unified moral framework is The Abolition of Man.

The book developed from three lectures Lewis delivered at the University of Durham in February 1943. It criticizes an approach to education that, in his view, treated moral judgments as merely subjective emotional reactions. Lewis defended what he called the Tao, a term he used for a cross-cultural body of objective moral principles.

The Abolition of Man is a work of moral philosophy rather than a Narnia story or a conventional autobiography. Its title refers to the possibility that technological power and the rejection of objective value could reduce human beings’ capacity for rational moral judgment. The book is frequently paired with That Hideous Strength, whose fiction explores related concerns, but the two works are different genres and titles.