Surveys were conducted at two metta meditation retreats in order to examine the psychological effects of metta meditation. Participants were invited to complete the survey at the beginning of the retreat, at the end of the retreat, and two weeks after the end of the retreat. Participants completed the same scales at each time phase, which included measures of happiness, compassionate love, revenge and avoidance motivation, gratitude, and a depression, anxiety and stress scale. Significant increases were found in happiness and (...) compassionate love, reductions in avoidance and revenge, and reductions on the depression, anxiety and stress subscales. (shrink)