O Lord Jesus Christ, only begotten Son of God, in Your Word, You have prescribed for us this rule of love: "Love your enemies, and pray for those who persecute you" (Matt 5:44). I pray also to You, the most generous forgiver of sins, for my enemies and for those who persecute the church. Give me the grace of Your Holy Spirit so that I not only forgive my enemies from the heart, but also heartily pray for their salvation. Do not sharpen over them the stern sword of revenge; instead, anoint their heads with the oil of mercy. Extinguish in their hearts the hot ashes of wrath and hatred so that they do not flame up into the infernal fires of hell. May they recognize that life is quickly dissipating vapor and smoke (James 4:14), our bodies fleeting ashes and dust (Sirach 10:9). Then in their mortal bodies they will not bear immortal wrath nor receive the enemy of their souls into the feeble home of their earthen body.
May they recognize that this deep-seated hatred is their greatest enemy because it kills the soul and excludes them from participation in heavenly life. Enlighten their minds so they gaze into the mirror of divine mercy and recognize the ugliness of anger and hatred. Direct their wills so they are moved by teh example of divine forgiveness and resist the inclination to be angry and to injure. Graciously allow that, as much as it depend on me, I may live peacefully with all people. Turn the hearts of my enemies to reconciliation. May we walk harmoniously on the path of this life because we hope for one place in the heavenly kingdom. May we not be separated on earth because we desire to live as one in heaven. We call on You, the one Lord and God of heaven. It is by no means right that servants of the one Lord are not united. We are only mystical body under Christ the Head. For members of one body to fight one another is disgraceful and dishonorable. For those whose faith is one, and whose Baptism is one, it is fitting that they be one in body and soul.
--Blessed Johann Gerhard *Meditations on Divine Mercy* pp. 146,147