Which C.S. Lewis book, published in 1943, argues against reducing education to mere emotional conditioning?

The Abolition of Man is the C.S. Lewis book published in 1943 that argues against reducing education to emotional conditioning.

The book developed from three lectures Lewis delivered at the University of Durham in February 1943. He criticized an approach to language and moral judgment that, in his view, treated values as nothing more than subjective feelings. Lewis defended the importance of objective moral principles and human reason.

Its three chapters are titled “Men Without Chests,” “The Way,” and “The Abolition of Man.” The book is philosophical rather than fictional, and its argument is often discussed alongside Lewis’s Christian apologetics, although it does not follow the format of a conventional devotional work.