Guilt gets a bad rap as a relentless joke: Catholic guilt. Jewish guilt. Mormon guilt. Even Lutherans have guilt, or, some say, guilt envy. But as Yom Kippur, the Jewish Day of Atonement nears, experts say guilt is not passé, it's essential — and probably inescapable. "Guilt has been with us as long as humans have psyches, but we still don't know definitively how it works in the human psyche or the best way to deal with it," says Temple psychologist Frank Farley, former president of the American Psychological Association. Even so, Farley, faith writers and clergy say the best response to guilt is to face up, embrace it — then let it go.