There is much said today about improving our health by developing habits of optimism, whether facing a difficult medical diagnosis or a pile of dirty laundry. Barbara Fredrickson, PhD, a psychology professor at the University of North Carolina, says we should try activities that build joy, gratitude, love, and other positive feelings. We know, however, that more is required than a general wish for good feelings. We need a strong conviction that there is a source of joy, peace, and love upon which we can depend.