Which C.S. Lewis book is a 1960 study of four kinds of love?

The Four Loves is C.S. Lewis’s 1960 study of four kinds of love.

Published in 1960, the book examines four Greek terms used to distinguish forms of affection: storge, philia, eros, and agape. Lewis discusses each concept through literary, philosophical, and theological reflection rather than treating love as one uniform experience.

Storge refers to natural affection, philia to friendship, eros to romantic or sexual love, and agape to self-giving love. Lewis notes that these categories can overlap in real relationships, so the book is not simply a rigid classification system.

The Four Loves developed from a BBC radio series and belongs to Lewis’s nonfiction rather than his fictional works. It is sometimes confused with The Allegory of Love, an earlier academic study by Lewis about medieval and Renaissance literature, but the two books have different subjects and purposes.