The Mass, Dr. Killinger argues, is unsurpassable one design for worship but, like other historical forms, it becomes oppressive when it is maintained as an exclusive mode. Old art still has power to move men, but new visions need new creativity. So, too, with worship. Here is a book by a man who has been as depressed as the rest of us at what he has seen in Christian worship, full of suggestion for giving that worship real life without lapsing into false modernity or liturgiological sterility.