Need-love cries to God from our poverty; Gift-love longs to serve, or even to suffer for, God; Appreciative love says: "We give thanks to thee for thy great glory." Need-love says of a woman "I cannot live without her"; Gift-love longs to give her happiness, comfort, protection — if possible, wealth; Appreciative love gazes and holds its breath and is silent, rejoices that such a wonder should exist even if not for him, will not be wholly dejected by losing her, would rather have it so than never to have seen her at all.

The Four Loves (1960)