Forgiveness therapy for the promotion of wellbeing: A systematic review and meta-analysis by Akhtar, S, Barlow, J

“…There was also evidence of improvements in state (SMD = −0.55, 95% CI [−0.88, −0.21) and trait (SMD = −0.43, 95% CI [−0.67, −0.20]) forgiveness. The findings provide moderately strong evidence to suggest that forgiving a variety of real-life interpersonal offenses can be effective in promoting different dimensions of mental well-being. …”

Understanding the relationship between state forgiveness and psychological wellbeing: a qualitative study by Akhtar, S, Dolan, A, Barlow, J

“…Over the last 20 years, increasing attention has been given to associations between dispositional forgiveness and specific mental health problems. However, few studies have assessed whether forgiving real-life interpersonal hurts may be related to diverse psychological health outcomes. …”