C. S. Lewis investigates whether objective moral values exist independently of human opinion or if they are merely subjective social constructs. Drawing upon his expertise in classical literature and philosophy, Lewis critiques the modern educational trends of his time, which he argues undermine the foundation of human nature. He presents a rigorous defense of the 'Tao'—a universal moral law—and warns that the abandonment of these objective standards leads to the dehumanization of society.

This work is widely regarded as a foundational text in 20th-century moral philosophy, frequently cited for its prescient warnings about the erosion of objective truth. The text remains a standard reference for scholars and students interested in the intersection of ethics, education, and the preservation of human dignity.