God of Perfect Peace
God of perfect peace,
violence and cruelty can have no part with you.
May those who are at peace with one another
hold fast to the good will that unites them;
may those who are enemies forget their hatred and be healed.
We ask this through our Lord Jesus Christ, your Son,
who lives and reigns with you and the Holy Spirit, one God,
for ever and ever.
Source: Roman Catholic Sacramentary, Masses for Peace and Justice.