The Four Loves is a 1960 book by C. S. Lewis which explores the nature of love from a Christian and philosophical perspective through thought experiments. The book was based on a set of radio talks from 1958 which had been criticized in the U.S. at the time for their frankness about sex. C.S. Lewis examines storge or empathy love; philia, friendship love; eros, romantic love; and agape, or God love. Excerpt: "GOD is love," says St. John. When I first tried to write this book I thought that his maxim would provide me with a very plain highroad through the whole subject. I thought I should be able to say that human loves deserved to be called loves at all just in so far as they resembled that Love which is God."