The Four Loves by C.S. Lewis

C.S. Lewis's famous inspirational work on the nature of love. 'The Four Loves' divides love into four categories: Affection, Friendship, Eros and Charity. The first three are loves which come naturally to the human race. Charity, however, the Gift-love of God, is divine in its source and expression, and without the sweetening grace of this supernatural love, the natural loves become distorted and even dangerous.