Here’s a prayer for peace from the Catholic Online website.
Prayer for Peace
Lord, we pray for the power to be gentle;
the strength to be forgiving;
the patience to be understanding;
and the endurance to accept the consequences
of holding to what we believe to be right.
May we put our trust in the power of good to overcome evil
and the power of love to overcome hatred.
We pray for the vision to see and the faith to believe
in a world emancipated from violence,
a new world where fear shall no longer lead men to commit injustice,
nor selfishness make them bring suffering to others.
Help us to devote our whole life and thought and energy
to the task of making peace,
praying always for the inspiration and the power
to fulfill the destiny for which we and all men were created.
~ Prayer for World Peace, 1978. Posted on Catholic Online website. http://www.catholic.org/prayers/prayer.php?p=1700