Abba Dorotheus, a Desert Father of the sixth century, says that we can be healed of the sickness of resentment, "by prayer right from the heart for the one who has annoyed us. We can pray such words as, 'O God, help my brother, and me through his prayers.'" "In this," says Abba Dorotheus, "we are interceding for our brother, which is a sure sign of sympathy and love, and we are humiliating ourselves by asking help through our brother's prayers.” [see footnote below]
When we continually force ourselves to bless and pray for others in this way, we will find that our Lord Jesus Christ will change, renew, and refresh our hearts. It may take some time and persistence, but gradually, almost imperceptibly, we will be changed. The poison of resentment, by the Grace of Christ, will leave our system.
St. Dorotheus of Gaza, Discourses and Sayings (Kalamazoo, Mich.: Cistercian Publications, 1977), p. 154