When you self-forgive, you are practicing the virtue of mercy toward yourself. And this next point is very important: You continually extend virtues toward yourself, such as being fair to yourself (the virtue of justice), taking care of yourself (the virtues of kindness and wisdom), and being patient with yourself when you are learning new things in life. If you can practice all of these virtues toward yourself, why would anyone want to bar you from the most important of the moral virtues: loving yourself in the face of disappointment, disapproval, and in extreme cases, self-hatred?
Enright, Robert (2015-09-28). 8 Keys to Forgiveness (8 Keys to Mental Health) (p. 181). W. W. Norton & Company. Kindle Edition.