" Ancient ethics always dealt with three questions. Modern ethics usually deals with only one, or at the most two. The three questions are like the three things a fleet of ships is told by its sailing orders. (The metaphor is from C. S. Lewis.) First, the ships must know how to avoid bumping into each other. This is social ethics, and modern as well as ancient ethicists deal with it. Second, they must know how to stay shipshape and avoid sinking. This is individual ethics, virtues and vices, character building, and we hear very little about this from our modern ethical philosophers. Third, and most important of all, they must know why the fleet is at sea in the first place. What is their mission, their destination? This is the question of the summum bonum, and no modern philosophers except the existentialists seem even to be interested in this, the greatest of all questions. Perhaps that is why most modern philosophy seems so weak and wimpy, so specialized and elitist, and above all so boring, to ordinary people. "

― Peter Kreeft , Three Philosophies of Life: Ecclesiastes—Life As Vanity, Job—Life As Suffering, Song of Songs—Life As Love