Au hazard Balthazar can have a profoundly moving effect on those who are sensitive to its power. Like any film by Robert Bresson, it provokes widely different responses: Many critics have hailed it as a masterpiece, while others (as Pauline Kael observed) “may find it painstakingly tedious and offensively holy.” It all depends on what the viewer brings to Bresson’s seemingly simple tale of a donk…