Which C.S. Lewis book argues that moral education is being weakened by modern subjectivism?

The Abolition of Man argues that moral education is weakened by modern subjectivism.

Lewis published The Abolition of Man in 1943 after delivering the Riddell Memorial Lectures at the University of Durham. The short book responds to educational ideas that, in his view, treated value judgments as merely subjective emotional reactions. Lewis argues that human cultures share an objective moral order, which he calls the Tao.

The work is organized in three chapters: “Men Without Chests,” “The Way,” and “The Abolition of Man.” Lewis warns that rejecting objective value can leave people vulnerable to manipulation by those who control education, science, or social institutions.

The book is philosophical rather than fictional. It is therefore distinct from Mere Christianity, which developed from broadcast talks, and The Problem of Pain, which examines suffering and Christian belief. Readers also sometimes confuse the title with a claim that Lewis opposed science itself; his criticism is directed at science detached from moral limits and human purpose.