“I have never gone to sleep with a grievance against anyone, and, as far as I could, I have never let anyone go to sleep with a grievance against me.” St. Agatho

Is this not a sure way to live and sleep in peace? He was probably aware of St. Paul’s admonition. “Be angry but do not sin; do not let the sun set on your anger, and do not leave room for the devil.”  (Ephesians 4:26-27) Things will happen and we will react in a negative way. That is the Law of sin within us. What we do can be the Law of grace. Forgive and ask forgiveness, then let it go. Otherwise, a foothold is given to the devil to keep the wound infected. If your eternal salvation is at stake, is holding on to the grievance worth it?  Without forgiveness, it is at stake. Your self-righteousness is not worth it.