Grace. We talk as though we understand the term. The bank gives us a grace period. The seedy politician falls from grace. Musicians speak of a grace note. We describe an actress as gracious, a dancer as graceful. We use the word for hospitals, baby girls, kings, and premeal prayers. We talk as though we know what grace means. But do we really understand it? Have we settled for wimpy grace? It politely occupies a phrase in a hymn, fits...