Which C.S. Lewis work was published in 1960 as a study of four kinds of love?

The Four Loves was published by C.S. Lewis in 1960 as a study of four kinds of love.

The book grew out of a series of radio talks broadcast by the BBC in 1958. Lewis examines four Greek terms and the kinds of human relationship they can represent: affection, friendship, erotic love, and charity. In the English text, these are commonly presented as storge, philia, eros, and agape.

Lewis distinguishes the loves without treating them as completely isolated. He argues that natural human loves can become distorted when treated as ultimate, while divine love can transform and order them. The work therefore combines philosophical reflection, Christian theology, and observations about ordinary relationships.

The Four Loves is sometimes confused with The Problem of Pain or Mere Christianity because all three are nonfiction works for general readers. It is specifically the book in which Lewis develops his four-part account of affection, friendship, eros, and charity.