The creative will presses on to Its end, regardless of what It may suffer by the way. It does not choose suffering, but It will not avoid it, and must expect it. We say that It is Love, and “sacrifices” Itself for what It loves; and this is true, provided we understand what we mean by sacrifice. Sacrifice is what it looks like to other people, but to That-which-Loves I think its does not appear so. When one really cares, the self-is forgotten, and the sacrifice becomes only part of the activity. Ask yourself: If there is something you supremely want to do, do you count as “self-sacrifice” the difficulties encountered or other possible activities cast aside? You do not. The time when you deliberately say, “I must sacrifice this, that or the other” is when you do not supremely desire the end in view. At such times you are doing your duty, and that is admirable, but it is not love. But as soon as your duty becomes your love “self-sacrifice” is taken for granted, and, whatever the world calls it, you call it so no longer.
Dorothy Leigh Sayers, from What Do We Believe? (1940) in Unpopular Opinions
Sayers rightly outlines the vital relationship between love and duty. Morality is simply the clothes that love must wear in a world where love is not inevitable.