During the initial enrollment visit, participants will receive a treatment manual. In person or by telephone, the study interventionist will review the introductory portion of the manual and discuss the first exercise (Gratitude for Positive Events) with the participant. In subsequent weeks, exercises will be completed independently by participants, recorded in their treatment manual, and then discussed over the phone with their trainer. In the final week, after the final exercise is reviewed, the interventionist and participant will discuss future implementation and ways to incorporate the principles into daily life.