Which C.S. Lewis book argues that pain can serve a role in Christian belief?

The C.S. Lewis book that examines pain in Christian belief is The Problem of Pain. First published in 1940, it addresses questions about suffering, divine goodness, human freedom, and the existence of evil.

Lewis wrote the book as a philosophical and theological discussion rather than as a personal diary. He considers why a good and powerful God might permit suffering and argues that pain can expose human dependence and challenge self-centered ideas of happiness.

The Problem of Pain is often confused with A Grief Observed, which Lewis wrote after the death of his wife, Joy Davidman. A Grief Observed is more personal and anguished, while The Problem of Pain is a structured examination of the subject.